Algebra Examples

$3 x + 5 y - z = 9$ , $x + y + 2 z = 4$

Step 1

Solve the equation for $y$ .

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Step 1.1

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

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Step 1.1.1

Subtract $3 x$ from both sides of the equation.

$5 y - z = 9 - 3 x$

$x + y + 2 z = 4$

Step 1.1.2

Add $z$ to both sides of the equation.

$5 y = 9 - 3 x + z$

$x + y + 2 z = 4$

$5 y = 9 - 3 x + z$

$x + y + 2 z = 4$

Step 1.2

Divide each term in $5 y = 9 - 3 x + z$ by $5$ and simplify.

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Step 1.2.1

Divide each term in $5 y = 9 - 3 x + z$ by $5$ .

$\frac{5 y}{5} = \frac{9}{5} + \frac{- 3 x}{5} + \frac{z}{5}$

$x + y + 2 z = 4$

Step 1.2.2

Simplify the left side.

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Step 1.2.2.1

Cancel the common factor of $5$ .

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Step 1.2.2.1.1

Cancel the common factor.

$\frac{5 y}{5} = \frac{9}{5} + \frac{- 3 x}{5} + \frac{z}{5}$

$x + y + 2 z = 4$

Step 1.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{9}{5} + \frac{- 3 x}{5} + \frac{z}{5}$

$x + y + 2 z = 4$

$y = \frac{9}{5} + \frac{- 3 x}{5} + \frac{z}{5}$

$x + y + 2 z = 4$

$y = \frac{9}{5} + \frac{- 3 x}{5} + \frac{z}{5}$

$x + y + 2 z = 4$

Step 1.2.3

Simplify the right side.

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Step 1.2.3.1

Move the negative in front of the fraction.

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$x + y + 2 z = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$x + y + 2 z = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$x + y + 2 z = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$x + y + 2 z = 4$

Step 2

Solve the equation for $z$ .

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Step 2.1

Simplify $x + \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5} + 2 z$ .

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Step 2.1.1

To write $x$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$x \cdot \frac{5}{5} - \frac{3 x}{5} + \frac{9}{5} + \frac{z}{5} + 2 z = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.1.2

Simplify terms.

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Step 2.1.2.1

Combine $x$ and $\frac{5}{5}$ .

$\frac{x \cdot 5}{5} - \frac{3 x}{5} + \frac{9}{5} + \frac{z}{5} + 2 z = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.1.2.2

Combine the numerators over the common denominator.

$\frac{x \cdot 5 - 3 x}{5} + \frac{9}{5} + \frac{z}{5} + 2 z = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.1.2.3

Combine the numerators over the common denominator.

$2 z + \frac{x \cdot 5 - 3 x + 9 + z}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$2 z + \frac{x \cdot 5 - 3 x + 9 + z}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.1.3

Move $5$ to the left of $x$ .

$2 z + \frac{5 x - 3 x + 9 + z}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.1.4

Subtract $3 x$ from $5 x$ .

$2 z + \frac{2 x + 9 + z}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.1.5

To write $2 z$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$2 z \cdot \frac{5}{5} + \frac{2 x + 9 + z}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.1.6

Simplify terms.

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Step 2.1.6.1

Combine $2 z$ and $\frac{5}{5}$ .

$\frac{2 z \cdot 5}{5} + \frac{2 x + 9 + z}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.1.6.2

Combine the numerators over the common denominator.

$\frac{2 z \cdot 5 + 2 x + 9 + z}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$\frac{2 z \cdot 5 + 2 x + 9 + z}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.1.7

Simplify the numerator.

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Step 2.1.7.1

Multiply $5$ by $2$ .

$\frac{10 z + 2 x + 9 + z}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.1.7.2

Add $10 z$ and $z$ .

$\frac{11 z + 2 x + 9}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$\frac{11 z + 2 x + 9}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$\frac{11 z + 2 x + 9}{5} = 4$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.2

Multiply both sides by $5$ .

$\frac{11 z + 2 x + 9}{5} \cdot 5 = 4 \cdot 5$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.3

Simplify.

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Step 2.3.1

Simplify the left side.

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Step 2.3.1.1

Simplify $\frac{11 z + 2 x + 9}{5} \cdot 5$ .

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Step 2.3.1.1.1

Cancel the common factor of $5$ .

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Step 2.3.1.1.1.1

Cancel the common factor.

$\frac{11 z + 2 x + 9}{5} \cdot 5 = 4 \cdot 5$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.3.1.1.1.2

Rewrite the expression.

$11 z + 2 x + 9 = 4 \cdot 5$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$11 z + 2 x + 9 = 4 \cdot 5$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.3.1.1.2

Reorder $11 z$ and $2 x$ .

$2 x + 11 z + 9 = 4 \cdot 5$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$2 x + 11 z + 9 = 4 \cdot 5$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$2 x + 11 z + 9 = 4 \cdot 5$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.3.2

Simplify the right side.

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Step 2.3.2.1

Multiply $4$ by $5$ .

$2 x + 11 z + 9 = 20$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$2 x + 11 z + 9 = 20$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$2 x + 11 z + 9 = 20$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.4

Solve for $z$ .

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Step 2.4.1

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

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Step 2.4.1.1

Subtract $2 x$ from both sides of the equation.

$11 z + 9 = 20 - 2 x$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.4.1.2

Subtract $9$ from both sides of the equation.

$11 z = 20 - 2 x - 9$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.4.1.3

Subtract $9$ from $20$ .

$11 z = - 2 x + 11$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$11 z = - 2 x + 11$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.4.2

Divide each term in $11 z = - 2 x + 11$ by $11$ and simplify.

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Step 2.4.2.1

Divide each term in $11 z = - 2 x + 11$ by $11$ .

$\frac{11 z}{11} = \frac{- 2 x}{11} + \frac{11}{11}$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.4.2.2

Simplify the left side.

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Step 2.4.2.2.1

Cancel the common factor of $11$ .

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Step 2.4.2.2.1.1

Cancel the common factor.

$\frac{11 z}{11} = \frac{- 2 x}{11} + \frac{11}{11}$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.4.2.2.1.2

Divide $z$ by $1$ .

$z = \frac{- 2 x}{11} + \frac{11}{11}$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$z = \frac{- 2 x}{11} + \frac{11}{11}$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$z = \frac{- 2 x}{11} + \frac{11}{11}$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.4.2.3

Simplify the right side.

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Step 2.4.2.3.1

Simplify each term.

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Step 2.4.2.3.1.1

Move the negative in front of the fraction.

$z = - \frac{(2) x}{11} + \frac{11}{11}$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 2.4.2.3.1.2

Divide $11$ by $11$ .

$z = - \frac{2 x}{11} + 1$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$z = - \frac{2 x}{11} + 1$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$z = - \frac{2 x}{11} + 1$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$z = - \frac{2 x}{11} + 1$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$z = - \frac{2 x}{11} + 1$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

$z = - \frac{2 x}{11} + 1$

$y = \frac{9}{5} - \frac{3 x}{5} + \frac{z}{5}$

Step 3

Simplify the right side.

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Step 3.1

Simplify $\frac{9}{5} - \frac{3 x}{5} + \frac{- \frac{2 x}{11} + 1}{5}$ .

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Step 3.1.1

Combine the numerators over the common denominator.

$y = \frac{9 - 3 x - \frac{2 x}{11} + 1}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.2

Add $9$ and $1$ .

$y = \frac{- 3 x - \frac{2 x}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.3

To write $- 3 x$ as a fraction with a common denominator, multiply by $\frac{11}{11}$ .

$y = \frac{- 3 x \cdot \frac{11}{11} - \frac{2 x}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.4

Simplify terms.

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Step 3.1.4.1

Combine $- 3 x$ and $\frac{11}{11}$ .

$y = \frac{\frac{- 3 x \cdot 11}{11} - \frac{2 x}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.4.2

Combine the numerators over the common denominator.

$y = \frac{\frac{- 3 x \cdot 11 - 2 x}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

$y = \frac{\frac{- 3 x \cdot 11 - 2 x}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.5

Simplify each term.

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Step 3.1.5.1

Simplify the numerator.

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Step 3.1.5.1.1

Factor $x$ out of $- 3 x \cdot 11 - 2 x$ .

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Step 3.1.5.1.1.1

Factor $x$ out of $- 3 x \cdot 11$ .

$y = \frac{\frac{x (- 3 \cdot 11) - 2 x}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.5.1.1.2

Factor $x$ out of $- 2 x$ .

$y = \frac{\frac{x (- 3 \cdot 11) + x \cdot - 2}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.5.1.1.3

Factor $x$ out of $x (- 3 \cdot 11) + x \cdot - 2$ .

$y = \frac{\frac{x (- 3 \cdot 11 - 2)}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

$y = \frac{\frac{x (- 3 \cdot 11 - 2)}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.5.1.2

Multiply $- 3$ by $11$ .

$y = \frac{\frac{x (- 33 - 2)}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.5.1.3

Subtract $2$ from $- 33$ .

$y = \frac{\frac{x \cdot - 35}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

$y = \frac{\frac{x \cdot - 35}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.5.2

Move $- 35$ to the left of $x$ .

$y = \frac{\frac{- 35 \cdot x}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.5.3

Move the negative in front of the fraction.

$y = \frac{- \frac{35 x}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

$y = \frac{- \frac{35 x}{11} + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.6

Cancel the common factor of $- \frac{35 x}{11} + 10$ and $5$ .

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Step 3.1.6.1

Factor $5$ out of $- \frac{35 x}{11}$ .

$y = \frac{5 (- \frac{7 x}{11}) + 10}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.6.2

Factor $5$ out of $10$ .

$y = \frac{5 (- \frac{7 x}{11}) + 5 \cdot 2}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.6.3

Factor $5$ out of $5 (- \frac{7 x}{11}) + 5 (2)$ .

$y = \frac{5 (- \frac{7 x}{11} + 2)}{5}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.6.4

Cancel the common factors.

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Step 3.1.6.4.1

Factor $5$ out of $5$ .

$y = \frac{5 (- \frac{7 x}{11} + 2)}{5 (1)}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.6.4.2

Cancel the common factor.

$y = \frac{5 (- \frac{7 x}{11} + 2)}{5 \cdot 1}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.6.4.3

Rewrite the expression.

$y = \frac{- \frac{7 x}{11} + 2}{1}$

$z = - \frac{2 x}{11} + 1$

Step 3.1.6.4.4

Divide $- \frac{7 x}{11} + 2$ by $1$ .

$y = - \frac{7 x}{11} + 2$

$z = - \frac{2 x}{11} + 1$

$y = - \frac{7 x}{11} + 2$

$z = - \frac{2 x}{11} + 1$

$y = - \frac{7 x}{11} + 2$

$z = - \frac{2 x}{11} + 1$

$y = - \frac{7 x}{11} + 2$

$z = - \frac{2 x}{11} + 1$

$y = - \frac{7 x}{11} + 2$

$z = - \frac{2 x}{11} + 1$