Algebra Examples

$[\begin{array}{c} 2 & 20 & - 4 \\ 10 & - 6 & 8 \\ 2 & 0 & 3 \end{array}] [\begin{array}{c} x \\ y \\ z \end{array}] = [\begin{array}{c} 40 \\ 16 \\ 7 \end{array}]$

Step 1

Multiply $[\begin{array}{c} 2 & 20 & - 4 \\ 10 & - 6 & 8 \\ 2 & 0 & 3 \end{array}] [\begin{array}{c} x \\ y \\ z \end{array}]$ .

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Step 1.1

Two matrices can be multiplied if and only if the number of columns in the first matrix is equal to the number of rows in the second matrix. In this case, the first matrix is $3 \times 3$ and the second matrix is $3 \times 1$ .

Step 1.2

Multiply each row in the first matrix by each column in the second matrix.

$[\begin{array}{c} 2 x + 20 y - 4 z \\ 10 x - 6 y + 8 z \\ 2 x + 0 y + 3 z \end{array}] = [\begin{array}{c} 40 \\ 16 \\ 7 \end{array}]$

Step 1.3

Simplify each element of the matrix by multiplying out all the expressions.

$[\begin{array}{c} 2 x + 20 y - 4 z \\ 10 x - 6 y + 8 z \\ 2 x + 3 z \end{array}] = [\begin{array}{c} 40 \\ 16 \\ 7 \end{array}]$

Step 2

Write as a linear system of equations.

$2 x + 20 y - 4 z = 40$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3

Solve the system of equations.

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Step 3.1

Solve for $x$ in $2 x + 20 y - 4 z = 40$ .

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Step 3.1.1

Move all terms not containing $x$ to the right side of the equation.

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Step 3.1.1.1

Subtract $20 y$ from both sides of the equation.

$2 x - 4 z = 40 - 20 y$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.1.2

Add $4 z$ to both sides of the equation.

$2 x = 40 - 20 y + 4 z$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

$2 x = 40 - 20 y + 4 z$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2

Divide each term in $2 x = 40 - 20 y + 4 z$ by $2$ and simplify.

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Step 3.1.2.1

Divide each term in $2 x = 40 - 20 y + 4 z$ by $2$ .

$\frac{2 x}{2} = \frac{40}{2} + \frac{- 20 y}{2} + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.2

Simplify the left side.

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Step 3.1.2.2.1

Cancel the common factor of $2$ .

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Step 3.1.2.2.1.1

Cancel the common factor.

$\frac{2 x}{2} = \frac{40}{2} + \frac{- 20 y}{2} + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.2.1.2

Divide $x$ by $1$ .

$x = \frac{40}{2} + \frac{- 20 y}{2} + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

$x = \frac{40}{2} + \frac{- 20 y}{2} + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

$x = \frac{40}{2} + \frac{- 20 y}{2} + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.3

Simplify the right side.

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Step 3.1.2.3.1

Simplify each term.

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Step 3.1.2.3.1.1

Divide $40$ by $2$ .

$x = 20 + \frac{- 20 y}{2} + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.3.1.2

Cancel the common factor of $- 20$ and $2$ .

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Step 3.1.2.3.1.2.1

Factor $2$ out of $- 20 y$ .

$x = 20 + \frac{2 (- 10 y)}{2} + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.3.1.2.2

Cancel the common factors.

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Step 3.1.2.3.1.2.2.1

Factor $2$ out of $2$ .

$x = 20 + \frac{2 (- 10 y)}{2 (1)} + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.3.1.2.2.2

Cancel the common factor.

$x = 20 + \frac{2 (- 10 y)}{2 \cdot 1} + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.3.1.2.2.3

Rewrite the expression.

$x = 20 + \frac{- 10 y}{1} + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.3.1.2.2.4

Divide $- 10 y$ by $1$ .

$x = 20 - 10 y + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

$x = 20 - 10 y + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

$x = 20 - 10 y + \frac{4 z}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.3.1.3

Cancel the common factor of $4$ and $2$ .

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Step 3.1.2.3.1.3.1

Factor $2$ out of $4 z$ .

$x = 20 - 10 y + \frac{2 (2 z)}{2}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.3.1.3.2

Cancel the common factors.

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Step 3.1.2.3.1.3.2.1

Factor $2$ out of $2$ .

$x = 20 - 10 y + \frac{2 (2 z)}{2 (1)}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.3.1.3.2.2

Cancel the common factor.

$x = 20 - 10 y + \frac{2 (2 z)}{2 \cdot 1}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.3.1.3.2.3

Rewrite the expression.

$x = 20 - 10 y + \frac{2 z}{1}$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.1.2.3.1.3.2.4

Divide $2 z$ by $1$ .

$x = 20 - 10 y + 2 z$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

$x = 20 - 10 y + 2 z$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

$x = 20 - 10 y + 2 z$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

$x = 20 - 10 y + 2 z$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

$x = 20 - 10 y + 2 z$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

$x = 20 - 10 y + 2 z$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

$x = 20 - 10 y + 2 z$

$10 x - 6 y + 8 z = 16$

$2 x + 3 z = 7$

Step 3.2

Replace all occurrences of $x$ with $20 - 10 y + 2 z$ in each equation.

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Step 3.2.1

Replace all occurrences of $x$ in $10 x - 6 y + 8 z = 16$ with $20 - 10 y + 2 z$ .

$10 (20 - 10 y + 2 z) - 6 y + 8 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Simplify $10 (20 - 10 y + 2 z) - 6 y + 8 z$ .

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Step 3.2.2.1.1

Simplify each term.

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Step 3.2.2.1.1.1

Apply the distributive property.

$10 \cdot 20 + 10 (- 10 y) + 10 (2 z) - 6 y + 8 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

Step 3.2.2.1.1.2

Simplify.

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Step 3.2.2.1.1.2.1

Multiply $10$ by $20$ .

$200 + 10 (- 10 y) + 10 (2 z) - 6 y + 8 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

Step 3.2.2.1.1.2.2

Multiply $- 10$ by $10$ .

$200 - 100 y + 10 (2 z) - 6 y + 8 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

Step 3.2.2.1.1.2.3

Multiply $2$ by $10$ .

$200 - 100 y + 20 z - 6 y + 8 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

$200 - 100 y + 20 z - 6 y + 8 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

$200 - 100 y + 20 z - 6 y + 8 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

Step 3.2.2.1.2

Simplify by adding terms.

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Step 3.2.2.1.2.1

Subtract $6 y$ from $- 100 y$ .

$200 - 106 y + 20 z + 8 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

Step 3.2.2.1.2.2

Add $20 z$ and $8 z$ .

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$2 x + 3 z = 7$

Step 3.2.3

Replace all occurrences of $x$ in $2 x + 3 z = 7$ with $20 - 10 y + 2 z$ .

$2 (20 - 10 y + 2 z) + 3 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.2.4

Simplify the left side.

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Step 3.2.4.1

Simplify $2 (20 - 10 y + 2 z) + 3 z$ .

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Step 3.2.4.1.1

Simplify each term.

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Step 3.2.4.1.1.1

Apply the distributive property.

$2 \cdot 20 + 2 (- 10 y) + 2 (2 z) + 3 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.2.4.1.1.2

Simplify.

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Step 3.2.4.1.1.2.1

Multiply $2$ by $20$ .

$40 + 2 (- 10 y) + 2 (2 z) + 3 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.2.4.1.1.2.2

Multiply $- 10$ by $2$ .

$40 - 20 y + 2 (2 z) + 3 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.2.4.1.1.2.3

Multiply $2$ by $2$ .

$40 - 20 y + 4 z + 3 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$40 - 20 y + 4 z + 3 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$40 - 20 y + 4 z + 3 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.2.4.1.2

Add $4 z$ and $3 z$ .

$40 - 20 y + 7 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$40 - 20 y + 7 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$40 - 20 y + 7 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$40 - 20 y + 7 z = 7$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.3

Solve for $y$ in $40 - 20 y + 7 z = 7$ .

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Step 3.3.1

Move all terms not containing $y$ to the right side of the equation.

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Step 3.3.1.1

Subtract $40$ from both sides of the equation.

$- 20 y + 7 z = 7 - 40$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.3.1.2

Subtract $7 z$ from both sides of the equation.

$- 20 y = 7 - 40 - 7 z$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.3.1.3

Subtract $40$ from $7$ .

$- 20 y = - 33 - 7 z$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$- 20 y = - 33 - 7 z$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.3.2

Divide each term in $- 20 y = - 33 - 7 z$ by $- 20$ and simplify.

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Step 3.3.2.1

Divide each term in $- 20 y = - 33 - 7 z$ by $- 20$ .

$\frac{- 20 y}{- 20} = \frac{- 33}{- 20} + \frac{- 7 z}{- 20}$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.3.2.2

Simplify the left side.

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Step 3.3.2.2.1

Cancel the common factor of $- 20$ .

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Step 3.3.2.2.1.1

Cancel the common factor.

$\frac{- 20 y}{- 20} = \frac{- 33}{- 20} + \frac{- 7 z}{- 20}$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.3.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{- 33}{- 20} + \frac{- 7 z}{- 20}$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$y = \frac{- 33}{- 20} + \frac{- 7 z}{- 20}$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$y = \frac{- 33}{- 20} + \frac{- 7 z}{- 20}$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.3.2.3

Simplify the right side.

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Step 3.3.2.3.1

Simplify each term.

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Step 3.3.2.3.1.1

Dividing two negative values results in a positive value.

$y = \frac{33}{20} + \frac{- 7 z}{- 20}$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.3.2.3.1.2

Dividing two negative values results in a positive value.

$y = \frac{33}{20} + \frac{7 z}{20}$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$y = \frac{33}{20} + \frac{7 z}{20}$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$y = \frac{33}{20} + \frac{7 z}{20}$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$y = \frac{33}{20} + \frac{7 z}{20}$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

$y = \frac{33}{20} + \frac{7 z}{20}$

$200 - 106 y + 28 z = 16$

$x = 20 - 10 y + 2 z$

Step 3.4

Replace all occurrences of $y$ with $\frac{33}{20} + \frac{7 z}{20}$ in each equation.

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Step 3.4.1

Replace all occurrences of $y$ in $200 - 106 y + 28 z = 16$ with $\frac{33}{20} + \frac{7 z}{20}$ .

$200 - 106 (\frac{33}{20} + \frac{7 z}{20}) + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2

Simplify the left side.

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Step 3.4.2.1

Simplify $200 - 106 (\frac{33}{20} + \frac{7 z}{20}) + 28 z$ .

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Step 3.4.2.1.1

Simplify each term.

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Step 3.4.2.1.1.1

Apply the distributive property.

$200 - 106 (\frac{33}{20}) - 106 \frac{7 z}{20} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.2

Cancel the common factor of $2$ .

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Step 3.4.2.1.1.2.1

Factor $2$ out of $- 106$ .

$200 + 2 (- 53) (\frac{33}{20}) - 106 \frac{7 z}{20} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.2.2

Factor $2$ out of $20$ .

$200 + 2 \cdot (- 53 \frac{33}{2 \cdot 10}) - 106 \frac{7 z}{20} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.2.3

Cancel the common factor.

$200 + 2 \cdot (- 53 \frac{33}{2 \cdot 10}) - 106 \frac{7 z}{20} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.2.4

Rewrite the expression.

$200 - 53 (\frac{33}{10}) - 106 \frac{7 z}{20} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

$200 - 53 (\frac{33}{10}) - 106 \frac{7 z}{20} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.3

Combine $- 53$ and $\frac{33}{10}$ .

$200 + \frac{- 53 \cdot 33}{10} - 106 \frac{7 z}{20} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.4

Multiply $- 53$ by $33$ .

$200 + \frac{- 1749}{10} - 106 \frac{7 z}{20} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.5

Cancel the common factor of $2$ .

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Step 3.4.2.1.1.5.1

Factor $2$ out of $- 106$ .

$200 + \frac{- 1749}{10} + 2 (- 53) (\frac{7 z}{20}) + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.5.2

Factor $2$ out of $20$ .

$200 + \frac{- 1749}{10} + 2 \cdot (- 53 \frac{7 z}{2 \cdot 10}) + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.5.3

Cancel the common factor.

$200 + \frac{- 1749}{10} + 2 \cdot (- 53 \frac{7 z}{2 \cdot 10}) + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.5.4

Rewrite the expression.

$200 + \frac{- 1749}{10} - 53 \frac{7 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

$200 + \frac{- 1749}{10} - 53 \frac{7 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.6

Combine $- 53$ and $\frac{7 z}{10}$ .

$200 + \frac{- 1749}{10} + \frac{- 53 (7 z)}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.7

Multiply $7$ by $- 53$ .

$200 + \frac{- 1749}{10} + \frac{- 371 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.8

Simplify each term.

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Step 3.4.2.1.1.8.1

Move the negative in front of the fraction.

$200 - \frac{1749}{10} + \frac{- 371 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.1.8.2

Move the negative in front of the fraction.

$200 - \frac{1749}{10} - \frac{371 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

$200 - \frac{1749}{10} - \frac{371 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

$200 - \frac{1749}{10} - \frac{371 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.2

To write $200$ as a fraction with a common denominator, multiply by $\frac{10}{10}$ .

$200 \cdot \frac{10}{10} - \frac{1749}{10} - \frac{371 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.3

Combine $200$ and $\frac{10}{10}$ .

$\frac{200 \cdot 10}{10} - \frac{1749}{10} - \frac{371 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.4

Combine the numerators over the common denominator.

$\frac{200 \cdot 10 - 1749}{10} - \frac{371 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.5

Simplify the numerator.

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Step 3.4.2.1.5.1

Multiply $200$ by $10$ .

$\frac{2000 - 1749}{10} - \frac{371 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.5.2

Subtract $1749$ from $2000$ .

$\frac{251}{10} - \frac{371 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

$\frac{251}{10} - \frac{371 z}{10} + 28 z = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.6

To write $28 z$ as a fraction with a common denominator, multiply by $\frac{10}{10}$ .

$\frac{251}{10} - \frac{371 z}{10} + 28 z \cdot \frac{10}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.7

Combine $28 z$ and $\frac{10}{10}$ .

$\frac{251}{10} - \frac{371 z}{10} + \frac{28 z \cdot 10}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.8

Combine the numerators over the common denominator.

$\frac{251}{10} + \frac{- 371 z + 28 z \cdot 10}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.9

Combine the numerators over the common denominator.

$\frac{251 - 371 z + 28 z \cdot 10}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.10

Multiply $10$ by $28$ .

$\frac{251 - 371 z + 280 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.2.1.11

Add $- 371 z$ and $280 z$ .

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 10 y + 2 z$

Step 3.4.3

Replace all occurrences of $y$ in $x = 20 - 10 y + 2 z$ with $\frac{33}{20} + \frac{7 z}{20}$ .

$x = 20 - 10 (\frac{33}{20} + \frac{7 z}{20}) + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4

Simplify the right side.

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Step 3.4.4.1

Simplify $20 - 10 (\frac{33}{20} + \frac{7 z}{20}) + 2 z$ .

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Step 3.4.4.1.1

Simplify each term.

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Step 3.4.4.1.1.1

Apply the distributive property.

$x = 20 - 10 (\frac{33}{20}) - 10 \frac{7 z}{20} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.1.2

Cancel the common factor of $10$ .

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Step 3.4.4.1.1.2.1

Factor $10$ out of $- 10$ .

$x = 20 + 10 (- 1) (\frac{33}{20}) - 10 \frac{7 z}{20} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.1.2.2

Factor $10$ out of $20$ .

$x = 20 + 10 \cdot (- 1 \frac{33}{10 \cdot 2}) - 10 \frac{7 z}{20} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.1.2.3

Cancel the common factor.

$x = 20 + 10 \cdot (- 1 \frac{33}{10 \cdot 2}) - 10 \frac{7 z}{20} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.1.2.4

Rewrite the expression.

$x = 20 - 1 (\frac{33}{2}) - 10 \frac{7 z}{20} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 1 (\frac{33}{2}) - 10 \frac{7 z}{20} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.1.3

Cancel the common factor of $10$ .

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Step 3.4.4.1.1.3.1

Factor $10$ out of $- 10$ .

$x = 20 - 1 (\frac{33}{2}) + 10 (- 1) (\frac{7 z}{20}) + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.1.3.2

Factor $10$ out of $20$ .

$x = 20 - 1 (\frac{33}{2}) + 10 \cdot (- 1 \frac{7 z}{10 \cdot 2}) + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.1.3.3

Cancel the common factor.

$x = 20 - 1 (\frac{33}{2}) + 10 \cdot (- 1 \frac{7 z}{10 \cdot 2}) + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.1.3.4

Rewrite the expression.

$x = 20 - 1 (\frac{33}{2}) - 1 \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - 1 (\frac{33}{2}) - 1 \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.1.4

Simplify each term.

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Step 3.4.4.1.1.4.1

Rewrite $- 1 (\frac{33}{2})$ as $- (\frac{33}{2})$ .

$x = 20 - (\frac{33}{2}) - 1 \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.1.4.2

Rewrite $- 1 \frac{7 z}{2}$ as $- \frac{7 z}{2}$ .

$x = 20 - \frac{33}{2} - \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - \frac{33}{2} - \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 20 - \frac{33}{2} - \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.2

To write $20$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$x = 20 \cdot \frac{2}{2} - \frac{33}{2} - \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.3

Combine $20$ and $\frac{2}{2}$ .

$x = \frac{20 \cdot 2}{2} - \frac{33}{2} - \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.4

Combine the numerators over the common denominator.

$x = \frac{20 \cdot 2 - 33}{2} - \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.5

Simplify the numerator.

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Step 3.4.4.1.5.1

Multiply $20$ by $2$ .

$x = \frac{40 - 33}{2} - \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.5.2

Subtract $33$ from $40$ .

$x = \frac{7}{2} - \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = \frac{7}{2} - \frac{7 z}{2} + 2 z$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.6

To write $2 z$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$x = \frac{7}{2} - \frac{7 z}{2} + 2 z \cdot \frac{2}{2}$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.7

Combine $2 z$ and $\frac{2}{2}$ .

$x = \frac{7}{2} - \frac{7 z}{2} + \frac{2 z \cdot 2}{2}$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.8

Combine the numerators over the common denominator.

$x = \frac{7}{2} + \frac{- 7 z + 2 z \cdot 2}{2}$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.9

Combine the numerators over the common denominator.

$x = \frac{7 - 7 z + 2 z \cdot 2}{2}$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.10

Multiply $2$ by $2$ .

$x = \frac{7 - 7 z + 4 z}{2}$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.4.4.1.11

Add $- 7 z$ and $4 z$ .

$x = \frac{7 - 3 z}{2}$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = \frac{7 - 3 z}{2}$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = \frac{7 - 3 z}{2}$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = \frac{7 - 3 z}{2}$

$\frac{251 - 91 z}{10} = 16$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.5

Solve for $z$ in $\frac{251 - 91 z}{10} = 16$ .

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Step 3.5.1

Multiply both sides by $10$ .

$\frac{251 - 91 z}{10} \cdot 10 = 16 \cdot 10$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.5.2

Simplify.

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Step 3.5.2.1

Simplify the left side.

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Step 3.5.2.1.1

Simplify $\frac{251 - 91 z}{10} \cdot 10$ .

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Step 3.5.2.1.1.1

Cancel the common factor of $10$ .

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Step 3.5.2.1.1.1.1

Cancel the common factor.

$\frac{251 - 91 z}{10} \cdot 10 = 16 \cdot 10$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.5.2.1.1.1.2

Rewrite the expression.

$251 - 91 z = 16 \cdot 10$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$251 - 91 z = 16 \cdot 10$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.5.2.1.1.2

Reorder $251$ and $- 91 z$ .

$- 91 z + 251 = 16 \cdot 10$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$- 91 z + 251 = 16 \cdot 10$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$- 91 z + 251 = 16 \cdot 10$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.5.2.2

Simplify the right side.

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Step 3.5.2.2.1

Multiply $16$ by $10$ .

$- 91 z + 251 = 160$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$- 91 z + 251 = 160$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$- 91 z + 251 = 160$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.5.3

Solve for $z$ .

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Step 3.5.3.1

Move all terms not containing $z$ to the right side of the equation.

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Step 3.5.3.1.1

Subtract $251$ from both sides of the equation.

$- 91 z = 160 - 251$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.5.3.1.2

Subtract $251$ from $160$ .

$- 91 z = - 91$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$- 91 z = - 91$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.5.3.2

Divide each term in $- 91 z = - 91$ by $- 91$ and simplify.

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Step 3.5.3.2.1

Divide each term in $- 91 z = - 91$ by $- 91$ .

$\frac{- 91 z}{- 91} = \frac{- 91}{- 91}$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.5.3.2.2

Simplify the left side.

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Step 3.5.3.2.2.1

Cancel the common factor of $- 91$ .

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Step 3.5.3.2.2.1.1

Cancel the common factor.

$\frac{- 91 z}{- 91} = \frac{- 91}{- 91}$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.5.3.2.2.1.2

Divide $z$ by $1$ .

$z = \frac{- 91}{- 91}$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$z = \frac{- 91}{- 91}$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$z = \frac{- 91}{- 91}$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.5.3.2.3

Simplify the right side.

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Step 3.5.3.2.3.1

Divide $- 91$ by $- 91$ .

$z = 1$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$z = 1$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$z = 1$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$z = 1$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

$z = 1$

$x = \frac{7 - 3 z}{2}$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.6

Replace all occurrences of $z$ with $1$ in each equation.

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Step 3.6.1

Replace all occurrences of $z$ in $x = \frac{7 - 3 z}{2}$ with $1$ .

$x = \frac{7 - 3 \cdot 1}{2}$

$z = 1$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.6.2

Simplify the right side.

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Step 3.6.2.1

Simplify $\frac{7 - 3 \cdot 1}{2}$ .

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Step 3.6.2.1.1

Simplify the numerator.

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Step 3.6.2.1.1.1

Multiply $- 3$ by $1$ .

$x = \frac{7 - 3}{2}$

$z = 1$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.6.2.1.1.2

Subtract $3$ from $7$ .

$x = \frac{4}{2}$

$z = 1$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = \frac{4}{2}$

$z = 1$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.6.2.1.2

Divide $4$ by $2$ .

$x = 2$

$z = 1$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 2$

$z = 1$

$y = \frac{33}{20} + \frac{7 z}{20}$

$x = 2$

$z = 1$

$y = \frac{33}{20} + \frac{7 z}{20}$

Step 3.6.3

Replace all occurrences of $z$ in $y = \frac{33}{20} + \frac{7 z}{20}$ with $1$ .

$y = \frac{33}{20} + \frac{7 (1)}{20}$

$x = 2$

$z = 1$

Step 3.6.4

Simplify the right side.

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Step 3.6.4.1

Simplify $\frac{33}{20} + \frac{7 (1)}{20}$ .

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Step 3.6.4.1.1

Combine the numerators over the common denominator.

$y = \frac{33 + 7 (1)}{20}$

$x = 2$

$z = 1$

Step 3.6.4.1.2

Simplify the expression.

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Step 3.6.4.1.2.1

Multiply $7$ by $1$ .

$y = \frac{33 + 7}{20}$

$x = 2$

$z = 1$

Step 3.6.4.1.2.2

Add $33$ and $7$ .

$y = \frac{40}{20}$

$x = 2$

$z = 1$

Step 3.6.4.1.2.3

Divide $40$ by $20$ .

$y = 2$

$x = 2$

$z = 1$

$y = 2$

$x = 2$

$z = 1$

$y = 2$

$x = 2$

$z = 1$

$y = 2$

$x = 2$

$z = 1$

$y = 2$

$x = 2$

$z = 1$

Step 3.7

List all of the solutions.

$y = 2, x = 2, z = 1$