Precalculus Examples

$w + x - y - 9 z = - 3$ , $2 w + 3 x + 2 y + 15 z = 12$ , $2 w + x + 2 y + 5 z = 8$

Step 1

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

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Step 1.1

Subtract $x$ from both sides of the equation.

$w - y - 9 z = - 3 - x$

$2 w + 3 x + 2 y + 15 z = 12$

$2 w + x + 2 y + 5 z = 8$

Step 1.2

Add $y$ to both sides of the equation.

$w - 9 z = - 3 - x + y$

$2 w + 3 x + 2 y + 15 z = 12$

$2 w + x + 2 y + 5 z = 8$

Step 1.3

Add $9 z$ to both sides of the equation.

$w = - 3 - x + y + 9 z$

$2 w + 3 x + 2 y + 15 z = 12$

$2 w + x + 2 y + 5 z = 8$

$w = - 3 - x + y + 9 z$

$2 w + 3 x + 2 y + 15 z = 12$

$2 w + x + 2 y + 5 z = 8$

Step 2

Solve the equation for $x$ .

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Step 2.1

Simplify $2 (- 3 - x + y + 9 z) + 3 x + 2 y + 15 z$ .

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Step 2.1.1

Simplify each term.

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Step 2.1.1.1

Apply the distributive property.

$2 \cdot - 3 + 2 (- x) + 2 y + 2 (9 z) + 3 x + 2 y + 15 z = 12$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

Step 2.1.1.2

Simplify.

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Step 2.1.1.2.1

Multiply $2$ by $- 3$ .

$- 6 + 2 (- x) + 2 y + 2 (9 z) + 3 x + 2 y + 15 z = 12$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

Step 2.1.1.2.2

Multiply $- 1$ by $2$ .

$- 6 - 2 x + 2 y + 2 (9 z) + 3 x + 2 y + 15 z = 12$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

Step 2.1.1.2.3

Multiply $9$ by $2$ .

$- 6 - 2 x + 2 y + 18 z + 3 x + 2 y + 15 z = 12$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

$- 6 - 2 x + 2 y + 18 z + 3 x + 2 y + 15 z = 12$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

$- 6 - 2 x + 2 y + 18 z + 3 x + 2 y + 15 z = 12$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

Step 2.1.2

Simplify by adding terms.

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Step 2.1.2.1

Add $- 2 x$ and $3 x$ .

$- 6 + x + 2 y + 18 z + 2 y + 15 z = 12$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

Step 2.1.2.2

Add $2 y$ and $2 y$ .

$- 6 + x + 4 y + 18 z + 15 z = 12$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

Step 2.1.2.3

Add $18 z$ and $15 z$ .

$- 6 + x + 4 y + 33 z = 12$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

$- 6 + x + 4 y + 33 z = 12$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

$- 6 + x + 4 y + 33 z = 12$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

Step 2.2

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

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Step 2.2.1

Add $6$ to both sides of the equation.

$x + 4 y + 33 z = 12 + 6$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

Step 2.2.2

Subtract $4 y$ from both sides of the equation.

$x + 33 z = 12 + 6 - 4 y$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

Step 2.2.3

Subtract $33 z$ from both sides of the equation.

$x = 12 + 6 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

Step 2.2.4

Add $12$ and $6$ .

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$2 w + x + 2 y + 5 z = 8$

Step 3

Solve the equation for $y$ .

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Step 3.1

Simplify $2 (- 3 - (18 - 4 y - 33 z) + y + 9 z) + 18 - 4 y - 33 z + 2 y + 5 z$ .

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Step 3.1.1

Simplify each term.

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Step 3.1.1.1

Simplify each term.

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Step 3.1.1.1.1

Apply the distributive property.

$2 (- 3 - 1 \cdot 18 - (- 4 y) - (- 33 z) + y + 9 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.1.1.2

Simplify.

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Step 3.1.1.1.2.1

Multiply $- 1$ by $18$ .

$2 (- 3 - 18 - (- 4 y) - (- 33 z) + y + 9 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.1.1.2.2

Multiply $- 4$ by $- 1$ .

$2 (- 3 - 18 + 4 y - (- 33 z) + y + 9 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.1.1.2.3

Multiply $- 33$ by $- 1$ .

$2 (- 3 - 18 + 4 y + 33 z + y + 9 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$2 (- 3 - 18 + 4 y + 33 z + y + 9 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$2 (- 3 - 18 + 4 y + 33 z + y + 9 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.1.2

Subtract $18$ from $- 3$ .

$2 (- 21 + 4 y + 33 z + y + 9 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.1.3

Add $4 y$ and $y$ .

$2 (- 21 + 5 y + 33 z + 9 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.1.4

Add $33 z$ and $9 z$ .

$2 (- 21 + 5 y + 42 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.1.5

Apply the distributive property.

$2 \cdot - 21 + 2 (5 y) + 2 (42 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.1.6

Simplify.

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Step 3.1.1.6.1

Multiply $2$ by $- 21$ .

$- 42 + 2 (5 y) + 2 (42 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.1.6.2

Multiply $5$ by $2$ .

$- 42 + 10 y + 2 (42 z) + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.1.6.3

Multiply $42$ by $2$ .

$- 42 + 10 y + 84 z + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$- 42 + 10 y + 84 z + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$- 42 + 10 y + 84 z + 18 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.2

Simplify by adding terms.

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Step 3.1.2.1

Add $- 42$ and $18$ .

$10 y + 84 z - 24 - 4 y - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.2.2

Subtract $4 y$ from $10 y$ .

$6 y + 84 z - 24 - 33 z + 2 y + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.2.3

Add $6 y$ and $2 y$ .

$8 y + 84 z - 24 - 33 z + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.2.4

Subtract $33 z$ from $84 z$ .

$8 y + 51 z - 24 + 5 z = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.1.2.5

Add $51 z$ and $5 z$ .

$8 y + 56 z - 24 = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$8 y + 56 z - 24 = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$8 y + 56 z - 24 = 8$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.2

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

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Step 3.2.1

Subtract $56 z$ from both sides of the equation.

$8 y - 24 = 8 - 56 z$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.2.2

Add $24$ to both sides of the equation.

$8 y = 8 - 56 z + 24$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.2.3

Add $8$ and $24$ .

$8 y = - 56 z + 32$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$8 y = - 56 z + 32$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.3

Divide each term in $8 y = - 56 z + 32$ by $8$ and simplify.

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Step 3.3.1

Divide each term in $8 y = - 56 z + 32$ by $8$ .

$\frac{8 y}{8} = \frac{- 56 z}{8} + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.3.2

Simplify the left side.

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Step 3.3.2.1

Cancel the common factor of $8$ .

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Step 3.3.2.1.1

Cancel the common factor.

$\frac{8 y}{8} = \frac{- 56 z}{8} + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{- 56 z}{8} + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$y = \frac{- 56 z}{8} + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$y = \frac{- 56 z}{8} + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.3.3

Simplify the right side.

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Step 3.3.3.1

Simplify each term.

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Step 3.3.3.1.1

Cancel the common factor of $- 56$ and $8$ .

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Step 3.3.3.1.1.1

Factor $8$ out of $- 56 z$ .

$y = \frac{8 (- 7 z)}{8} + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.3.3.1.1.2

Cancel the common factors.

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Step 3.3.3.1.1.2.1

Factor $8$ out of $8$ .

$y = \frac{8 (- 7 z)}{8 (1)} + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.3.3.1.1.2.2

Cancel the common factor.

$y = \frac{8 (- 7 z)}{8 \cdot 1} + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.3.3.1.1.2.3

Rewrite the expression.

$y = \frac{- 7 z}{1} + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.3.3.1.1.2.4

Divide $- 7 z$ by $1$ .

$y = - 7 z + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$y = - 7 z + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$y = - 7 z + \frac{32}{8}$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 3.3.3.1.2

Divide $32$ by $8$ .

$y = - 7 z + 4$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$y = - 7 z + 4$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$y = - 7 z + 4$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$y = - 7 z + 4$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

$y = - 7 z + 4$

$x = 18 - 4 y - 33 z$

$w = - 3 - x + y + 9 z$

Step 4

Simplify the right side.

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Step 4.1

Simplify $18 - 4 (- 7 z + 4) - 33 z$ .

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Step 4.1.1

Simplify each term.

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Step 4.1.1.1

Apply the distributive property.

$x = 18 - 4 (- 7 z) - 4 \cdot 4 - 33 z$

$y = - 7 z + 4$

$w = - 3 - x + y + 9 z$

Step 4.1.1.2

Multiply $- 7$ by $- 4$ .

$x = 18 + 28 z - 4 \cdot 4 - 33 z$

$y = - 7 z + 4$

$w = - 3 - x + y + 9 z$

Step 4.1.1.3

Multiply $- 4$ by $4$ .

$x = 18 + 28 z - 16 - 33 z$

$y = - 7 z + 4$

$w = - 3 - x + y + 9 z$

$x = 18 + 28 z - 16 - 33 z$

$y = - 7 z + 4$

$w = - 3 - x + y + 9 z$

Step 4.1.2

Simplify by adding terms.

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Step 4.1.2.1

Subtract $16$ from $18$ .

$x = 28 z + 2 - 33 z$

$y = - 7 z + 4$

$w = - 3 - x + y + 9 z$

Step 4.1.2.2

Subtract $33 z$ from $28 z$ .

$x = - 5 z + 2$

$y = - 7 z + 4$

$w = - 3 - x + y + 9 z$

$x = - 5 z + 2$

$y = - 7 z + 4$

$w = - 3 - x + y + 9 z$

$x = - 5 z + 2$

$y = - 7 z + 4$

$w = - 3 - x + y + 9 z$

$x = - 5 z + 2$

$y = - 7 z + 4$

$w = - 3 - x + y + 9 z$

Step 5

Substitute the calculated values for $x, y$ into the equation for $w$ .

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Step 5.1

Simplify the left side.

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Step 5.1.1

Remove parentheses.

$w = - 3 - (- 5 z + 2) - 7 z + 4 + 9 z$

$x = - 5 z + 2$

$y = - 7 z + 4$

$w = - 3 - (- 5 z + 2) - 7 z + 4 + 9 z$

$x = - 5 z + 2$

$y = - 7 z + 4$

Step 5.2

Simplify the right side.

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Step 5.2.1

Simplify $- 3 - (- 5 z + 2) - 7 z + 4 + 9 z$ .

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Step 5.2.1.1

Simplify each term.

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Step 5.2.1.1.1

Apply the distributive property.

$w = - 3 - (- 5 z) - 1 \cdot 2 - 7 z + 4 + 9 z$

$x = - 5 z + 2$

$y = - 7 z + 4$

Step 5.2.1.1.2

Multiply $- 5$ by $- 1$ .

$w = - 3 + 5 z - 1 \cdot 2 - 7 z + 4 + 9 z$

$x = - 5 z + 2$

$y = - 7 z + 4$

Step 5.2.1.1.3

Multiply $- 1$ by $2$ .

$w = - 3 + 5 z - 2 - 7 z + 4 + 9 z$

$x = - 5 z + 2$

$y = - 7 z + 4$

$w = - 3 + 5 z - 2 - 7 z + 4 + 9 z$

$x = - 5 z + 2$

$y = - 7 z + 4$

Step 5.2.1.2

Simplify by adding terms.

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Step 5.2.1.2.1

Subtract $2$ from $- 3$ .

$w = 5 z - 5 - 7 z + 4 + 9 z$

$x = - 5 z + 2$

$y = - 7 z + 4$

Step 5.2.1.2.2

Subtract $7 z$ from $5 z$ .

$w = - 2 z - 5 + 4 + 9 z$

$x = - 5 z + 2$

$y = - 7 z + 4$

Step 5.2.1.2.3

Add $- 2 z$ and $9 z$ .

$w = 7 z - 5 + 4$

$x = - 5 z + 2$

$y = - 7 z + 4$

Step 5.2.1.2.4

Add $- 5$ and $4$ .

$w = 7 z - 1$

$x = - 5 z + 2$

$y = - 7 z + 4$

$w = 7 z - 1$

$x = - 5 z + 2$

$y = - 7 z + 4$

$w = 7 z - 1$

$x = - 5 z + 2$

$y = - 7 z + 4$

$w = 7 z - 1$

$x = - 5 z + 2$

$y = - 7 z + 4$

$w = 7 z - 1$

$x = - 5 z + 2$

$y = - 7 z + 4$