Finite Math Examples

$x + y + z + w = 20$ , $2 x - y + z = 0$ , $3 x + 2 y + z - w = 30$ , $x - 2 y - 2 z + 2 w = - 5$

Step 1

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

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Step 1.1

Subtract $y$ from both sides of the equation.

$x + z + w = 20 - y$

$2 x - y + z = 0$

$3 x + 2 y + z - w = 30$

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

Step 1.2

Subtract $z$ from both sides of the equation.

$x + w = 20 - y - z$

$2 x - y + z = 0$

$3 x + 2 y + z - w = 30$

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

Step 1.3

Subtract $w$ from both sides of the equation.

$x = 20 - y - z - w$

$2 x - y + z = 0$

$3 x + 2 y + z - w = 30$

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

$x = 20 - y - z - w$

$2 x - y + z = 0$

$3 x + 2 y + z - w = 30$

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

Step 2

Replace all occurrences of $x$ with $20 - y - z - w$ in each equation.

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Step 2.1

Replace all occurrences of $x$ in $2 x - y + z = 0$ with $20 - y - z - w$ .

$2 (20 - y - z - w) - y + z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify $2 (20 - y - z - w) - y + z$ .

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Step 2.2.1.1

Simplify each term.

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Step 2.2.1.1.1

Apply the distributive property.

$2 \cdot 20 + 2 (- y) + 2 (- z) + 2 (- w) - y + z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

Step 2.2.1.1.2

Simplify.

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Step 2.2.1.1.2.1

Multiply $2$ by $20$ .

$40 + 2 (- y) + 2 (- z) + 2 (- w) - y + z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

Step 2.2.1.1.2.2

Multiply $- 1$ by $2$ .

$40 - 2 y + 2 (- z) + 2 (- w) - y + z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

Step 2.2.1.1.2.3

Multiply $- 1$ by $2$ .

$40 - 2 y - 2 z + 2 (- w) - y + z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

Step 2.2.1.1.2.4

Multiply $- 1$ by $2$ .

$40 - 2 y - 2 z - 2 w - y + z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

$40 - 2 y - 2 z - 2 w - y + z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

$40 - 2 y - 2 z - 2 w - y + z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

Step 2.2.1.2

Simplify by adding terms.

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Step 2.2.1.2.1

Subtract $y$ from $- 2 y$ .

$40 - 3 y - 2 z - 2 w + z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

Step 2.2.1.2.2

Add $- 2 z$ and $z$ .

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$3 x + 2 y + z - w = 30$

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

Step 2.3

Replace all occurrences of $x$ in $3 x + 2 y + z - w = 30$ with $20 - y - z - w$ .

$3 (20 - y - z - w) + 2 y + z - w = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

Step 2.4

Simplify the left side.

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Step 2.4.1

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

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Step 2.4.1.1

Simplify each term.

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Step 2.4.1.1.1

Apply the distributive property.

$3 \cdot 20 + 3 (- y) + 3 (- z) + 3 (- w) + 2 y + z - w = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

Step 2.4.1.1.2

Simplify.

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Step 2.4.1.1.2.1

Multiply $3$ by $20$ .

$60 + 3 (- y) + 3 (- z) + 3 (- w) + 2 y + z - w = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

Step 2.4.1.1.2.2

Multiply $- 1$ by $3$ .

$60 - 3 y + 3 (- z) + 3 (- w) + 2 y + z - w = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

Step 2.4.1.1.2.3

Multiply $- 1$ by $3$ .

$60 - 3 y - 3 z + 3 (- w) + 2 y + z - w = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

Step 2.4.1.1.2.4

Multiply $- 1$ by $3$ .

$60 - 3 y - 3 z - 3 w + 2 y + z - w = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

$60 - 3 y - 3 z - 3 w + 2 y + z - w = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

$60 - 3 y - 3 z - 3 w + 2 y + z - w = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

Step 2.4.1.2

Simplify by adding terms.

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Step 2.4.1.2.1

Add $- 3 y$ and $2 y$ .

$60 - y - 3 z - 3 w + z - w = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

Step 2.4.1.2.2

Add $- 3 z$ and $z$ .

$60 - y - 3 w - 2 z - w = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

Step 2.4.1.2.3

Subtract $w$ from $- 3 w$ .

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

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

Step 2.5

Replace all occurrences of $x$ in $x - 2 y - 2 z + 2 w = - 5$ with $20 - y - z - w$ .

$(20 - y - z - w) - 2 y - 2 z + 2 w = - 5$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 2.6

Simplify the left side.

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Step 2.6.1

Simplify $(20 - y - z - w) - 2 y - 2 z + 2 w$ .

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Step 2.6.1.1

Subtract $2 y$ from $- y$ .

$20 - 3 y - z - w - 2 z + 2 w = - 5$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 2.6.1.2

Subtract $2 z$ from $- z$ .

$20 - 3 y - w - 3 z + 2 w = - 5$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 2.6.1.3

Add $- w$ and $2 w$ .

$20 - 3 y + w - 3 z = - 5$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$20 - 3 y + w - 3 z = - 5$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$20 - 3 y + w - 3 z = - 5$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$20 - 3 y + w - 3 z = - 5$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 3

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

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Step 3.1

Subtract $20$ from both sides of the equation.

$- 3 y + w - 3 z = - 5 - 20$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 3.2

Add $3 y$ to both sides of the equation.

$w - 3 z = - 5 - 20 + 3 y$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 3.3

Add $3 z$ to both sides of the equation.

$w = - 5 - 20 + 3 y + 3 z$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 3.4

Subtract $20$ from $- 5$ .

$w = - 25 + 3 y + 3 z$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$w = - 25 + 3 y + 3 z$

$60 - y - 4 w - 2 z = 30$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 4

Replace all occurrences of $w$ with $- 25 + 3 y + 3 z$ in each equation.

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Step 4.1

Replace all occurrences of $w$ in $60 - y - 4 w - 2 z = 30$ with $- 25 + 3 y + 3 z$ .

$60 - y - 4 (- 25 + 3 y + 3 z) - 2 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 4.2

Simplify the left side.

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Step 4.2.1

Simplify $60 - y - 4 (- 25 + 3 y + 3 z) - 2 z$ .

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Step 4.2.1.1

Simplify each term.

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Step 4.2.1.1.1

Apply the distributive property.

$60 - y - 4 \cdot - 25 - 4 (3 y) - 4 (3 z) - 2 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 4.2.1.1.2

Simplify.

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Step 4.2.1.1.2.1

Multiply $- 4$ by $- 25$ .

$60 - y + 100 - 4 (3 y) - 4 (3 z) - 2 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 4.2.1.1.2.2

Multiply $3$ by $- 4$ .

$60 - y + 100 - 12 y - 4 (3 z) - 2 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 4.2.1.1.2.3

Multiply $3$ by $- 4$ .

$60 - y + 100 - 12 y - 12 z - 2 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$60 - y + 100 - 12 y - 12 z - 2 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$60 - y + 100 - 12 y - 12 z - 2 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 4.2.1.2

Simplify by adding terms.

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Step 4.2.1.2.1

Add $60$ and $100$ .

$- y + 160 - 12 y - 12 z - 2 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 4.2.1.2.2

Subtract $12 y$ from $- y$ .

$- 13 y + 160 - 12 z - 2 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 4.2.1.2.3

Subtract $2 z$ from $- 12 z$ .

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$40 - 3 y - 2 w - z = 0$

$x = 20 - y - z - w$

Step 4.3

Replace all occurrences of $w$ in $40 - 3 y - 2 w - z = 0$ with $- 25 + 3 y + 3 z$ .

$40 - 3 y - 2 (- 25 + 3 y + 3 z) - z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

Step 4.4

Simplify the left side.

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Step 4.4.1

Simplify $40 - 3 y - 2 (- 25 + 3 y + 3 z) - z$ .

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Step 4.4.1.1

Simplify each term.

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Step 4.4.1.1.1

Apply the distributive property.

$40 - 3 y - 2 \cdot - 25 - 2 (3 y) - 2 (3 z) - z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

Step 4.4.1.1.2

Simplify.

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Step 4.4.1.1.2.1

Multiply $- 2$ by $- 25$ .

$40 - 3 y + 50 - 2 (3 y) - 2 (3 z) - z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

Step 4.4.1.1.2.2

Multiply $3$ by $- 2$ .

$40 - 3 y + 50 - 6 y - 2 (3 z) - z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

Step 4.4.1.1.2.3

Multiply $3$ by $- 2$ .

$40 - 3 y + 50 - 6 y - 6 z - z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

$40 - 3 y + 50 - 6 y - 6 z - z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

$40 - 3 y + 50 - 6 y - 6 z - z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

Step 4.4.1.2

Simplify by adding terms.

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Step 4.4.1.2.1

Add $40$ and $50$ .

$- 3 y + 90 - 6 y - 6 z - z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

Step 4.4.1.2.2

Subtract $6 y$ from $- 3 y$ .

$- 9 y + 90 - 6 z - z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

Step 4.4.1.2.3

Subtract $z$ from $- 6 z$ .

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z - w$

Step 4.5

Replace all occurrences of $w$ in $x = 20 - y - z - w$ with $- 25 + 3 y + 3 z$ .

$x = 20 - y - z - (- 25 + 3 y + 3 z)$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 4.6

Simplify the right side.

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Step 4.6.1

Simplify $20 - y - z - (- 25 + 3 y + 3 z)$ .

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Step 4.6.1.1

Simplify each term.

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Step 4.6.1.1.1

Apply the distributive property.

$x = 20 - y - z + 25 - (3 y) - (3 z)$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 4.6.1.1.2

Simplify.

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Step 4.6.1.1.2.1

Multiply $- 1$ by $- 25$ .

$x = 20 - y - z + 25 - (3 y) - (3 z)$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 4.6.1.1.2.2

Multiply $3$ by $- 1$ .

$x = 20 - y - z + 25 - 3 y - (3 z)$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 4.6.1.1.2.3

Multiply $3$ by $- 1$ .

$x = 20 - y - z + 25 - 3 y - 3 z$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z + 25 - 3 y - 3 z$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = 20 - y - z + 25 - 3 y - 3 z$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 4.6.1.2

Simplify by adding terms.

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Step 4.6.1.2.1

Add $20$ and $25$ .

$x = - y - z + 45 - 3 y - 3 z$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 4.6.1.2.2

Subtract $3 y$ from $- y$ .

$x = - 4 y - z + 45 - 3 z$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 4.6.1.2.3

Subtract $3 z$ from $- z$ .

$x = - 4 y - 4 z + 45$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = - 4 y - 4 z + 45$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = - 4 y - 4 z + 45$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = - 4 y - 4 z + 45$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = - 4 y - 4 z + 45$

$- 9 y + 90 - 7 z = 0$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 5

Solve for $y$ in $- 9 y + 90 - 7 z = 0$ .

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Step 5.1

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

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Step 5.1.1

Subtract $90$ from both sides of the equation.

$- 9 y - 7 z = - 90$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 5.1.2

Add $7 z$ to both sides of the equation.

$- 9 y = - 90 + 7 z$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$- 9 y = - 90 + 7 z$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 5.2

Divide each term in $- 9 y = - 90 + 7 z$ by $- 9$ and simplify.

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Step 5.2.1

Divide each term in $- 9 y = - 90 + 7 z$ by $- 9$ .

$\frac{- 9 y}{- 9} = \frac{- 90}{- 9} + \frac{7 z}{- 9}$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 5.2.2

Simplify the left side.

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Step 5.2.2.1

Cancel the common factor of $- 9$ .

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Step 5.2.2.1.1

Cancel the common factor.

$\frac{- 9 y}{- 9} = \frac{- 90}{- 9} + \frac{7 z}{- 9}$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 5.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{- 90}{- 9} + \frac{7 z}{- 9}$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$y = \frac{- 90}{- 9} + \frac{7 z}{- 9}$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$y = \frac{- 90}{- 9} + \frac{7 z}{- 9}$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 5.2.3

Simplify the right side.

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Step 5.2.3.1

Simplify each term.

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Step 5.2.3.1.1

Divide $- 90$ by $- 9$ .

$y = 10 + \frac{7 z}{- 9}$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 5.2.3.1.2

Move the negative in front of the fraction.

$y = 10 - \frac{7 z}{9}$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$y = 10 - \frac{7 z}{9}$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$y = 10 - \frac{7 z}{9}$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$y = 10 - \frac{7 z}{9}$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$y = 10 - \frac{7 z}{9}$

$x = - 4 y - 4 z + 45$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6

Replace all occurrences of $y$ with $10 - \frac{7 z}{9}$ in each equation.

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Step 6.1

Replace all occurrences of $y$ in $x = - 4 y - 4 z + 45$ with $10 - \frac{7 z}{9}$ .

$x = - 4 (10 - \frac{7 z}{9}) - 4 z + 45$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2

Simplify the right side.

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Step 6.2.1

Simplify $- 4 (10 - \frac{7 z}{9}) - 4 z + 45$ .

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Step 6.2.1.1

Simplify each term.

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Step 6.2.1.1.1

Apply the distributive property.

$x = - 4 \cdot 10 - 4 (- \frac{7 z}{9}) - 4 z + 45$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.1.2

Multiply $- 4$ by $10$ .

$x = - 40 - 4 (- \frac{7 z}{9}) - 4 z + 45$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.1.3

Multiply $- 4 (- \frac{7 z}{9})$ .

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Step 6.2.1.1.3.1

Multiply $- 1$ by $- 4$ .

$x = - 40 + 4 (\frac{7 z}{9}) - 4 z + 45$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.1.3.2

Combine $4$ and $\frac{7 z}{9}$ .

$x = - 40 + \frac{4 (7 z)}{9} - 4 z + 45$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.1.3.3

Multiply $7$ by $4$ .

$x = - 40 + \frac{28 z}{9} - 4 z + 45$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = - 40 + \frac{28 z}{9} - 4 z + 45$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = - 40 + \frac{28 z}{9} - 4 z + 45$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.2

Add $- 40$ and $45$ .

$x = \frac{28 z}{9} - 4 z + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.3

To write $- 4 z$ as a fraction with a common denominator, multiply by $\frac{9}{9}$ .

$x = \frac{28 z}{9} - 4 z \cdot \frac{9}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.4

Simplify terms.

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Step 6.2.1.4.1

Combine $- 4 z$ and $\frac{9}{9}$ .

$x = \frac{28 z}{9} + \frac{- 4 z \cdot 9}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.4.2

Combine the numerators over the common denominator.

$x = \frac{28 z - 4 z \cdot 9}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = \frac{28 z - 4 z \cdot 9}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.5

Simplify each term.

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Step 6.2.1.5.1

Simplify the numerator.

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Step 6.2.1.5.1.1

Factor $4 z$ out of $28 z - 4 z \cdot 9$ .

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Step 6.2.1.5.1.1.1

Factor $4 z$ out of $28 z$ .

$x = \frac{4 z (7) - 4 z \cdot 9}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.5.1.1.2

Factor $4 z$ out of $- 4 z \cdot 9$ .

$x = \frac{4 z (7) + 4 z (- 1 \cdot 9)}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.5.1.1.3

Factor $4 z$ out of $4 z (7) + 4 z (- 1 \cdot 9)$ .

$x = \frac{4 z (7 - 1 \cdot 9)}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = \frac{4 z (7 - 1 \cdot 9)}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.5.1.2

Multiply $- 1$ by $9$ .

$x = \frac{4 z (7 - 9)}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.5.1.3

Subtract $9$ from $7$ .

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

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.5.1.4

Multiply $- 2$ by $4$ .

$x = \frac{- 8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = \frac{- 8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.2.1.5.2

Move the negative in front of the fraction.

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- 13 y + 160 - 14 z = 30$

$w = - 25 + 3 y + 3 z$

Step 6.3

Replace all occurrences of $y$ in $- 13 y + 160 - 14 z = 30$ with $10 - \frac{7 z}{9}$ .

$- 13 (10 - \frac{7 z}{9}) + 160 - 14 z = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4

Simplify the left side.

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Step 6.4.1

Simplify $- 13 (10 - \frac{7 z}{9}) + 160 - 14 z$ .

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Step 6.4.1.1

Simplify each term.

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Step 6.4.1.1.1

Apply the distributive property.

$- 13 \cdot 10 - 13 (- \frac{7 z}{9}) + 160 - 14 z = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.1.2

Multiply $- 13$ by $10$ .

$- 130 - 13 (- \frac{7 z}{9}) + 160 - 14 z = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.1.3

Multiply $- 13 (- \frac{7 z}{9})$ .

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Step 6.4.1.1.3.1

Multiply $- 1$ by $- 13$ .

$- 130 + 13 (\frac{7 z}{9}) + 160 - 14 z = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.1.3.2

Combine $13$ and $\frac{7 z}{9}$ .

$- 130 + \frac{13 (7 z)}{9} + 160 - 14 z = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.1.3.3

Multiply $7$ by $13$ .

$- 130 + \frac{91 z}{9} + 160 - 14 z = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

$- 130 + \frac{91 z}{9} + 160 - 14 z = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

$- 130 + \frac{91 z}{9} + 160 - 14 z = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.2

Add $- 130$ and $160$ .

$\frac{91 z}{9} + 30 - 14 z = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.3

To write $- 14 z$ as a fraction with a common denominator, multiply by $\frac{9}{9}$ .

$\frac{91 z}{9} - 14 z \cdot \frac{9}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.4

Simplify terms.

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Step 6.4.1.4.1

Combine $- 14 z$ and $\frac{9}{9}$ .

$\frac{91 z}{9} + \frac{- 14 z \cdot 9}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.4.2

Combine the numerators over the common denominator.

$\frac{91 z - 14 z \cdot 9}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

$\frac{91 z - 14 z \cdot 9}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.5

Simplify each term.

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Step 6.4.1.5.1

Simplify the numerator.

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Step 6.4.1.5.1.1

Factor $7 z$ out of $91 z - 14 z \cdot 9$ .

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Step 6.4.1.5.1.1.1

Factor $7 z$ out of $91 z$ .

$\frac{7 z (13) - 14 z \cdot 9}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.5.1.1.2

Factor $7 z$ out of $- 14 z \cdot 9$ .

$\frac{7 z (13) + 7 z (- 2 \cdot 9)}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.5.1.1.3

Factor $7 z$ out of $7 z (13) + 7 z (- 2 \cdot 9)$ .

$\frac{7 z (13 - 2 \cdot 9)}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

$\frac{7 z (13 - 2 \cdot 9)}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.5.1.2

Multiply $- 2$ by $9$ .

$\frac{7 z (13 - 18)}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.5.1.3

Subtract $18$ from $13$ .

$\frac{7 z \cdot - 5}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.5.1.4

Multiply $- 5$ by $7$ .

$\frac{- 35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

$\frac{- 35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.4.1.5.2

Move the negative in front of the fraction.

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 3 y + 3 z$

Step 6.5

Replace all occurrences of $y$ in $w = - 25 + 3 y + 3 z$ with $10 - \frac{7 z}{9}$ .

$w = - 25 + 3 (10 - \frac{7 z}{9}) + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6

Simplify the right side.

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Step 6.6.1

Simplify $- 25 + 3 (10 - \frac{7 z}{9}) + 3 z$ .

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Step 6.6.1.1

Simplify each term.

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Step 6.6.1.1.1

Apply the distributive property.

$w = - 25 + 3 \cdot 10 + 3 (- \frac{7 z}{9}) + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.1.2

Multiply $3$ by $10$ .

$w = - 25 + 30 + 3 (- \frac{7 z}{9}) + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.1.3

Cancel the common factor of $3$ .

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Step 6.6.1.1.3.1

Move the leading negative in $- \frac{7 z}{9}$ into the numerator.

$w = - 25 + 30 + 3 (\frac{- 7 z}{9}) + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.1.3.2

Factor $3$ out of $9$ .

$w = - 25 + 30 + 3 (\frac{- 7 z}{3 (3)}) + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.1.3.3

Cancel the common factor.

$w = - 25 + 30 + 3 (\frac{- 7 z}{3 \cdot 3}) + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.1.3.4

Rewrite the expression.

$w = - 25 + 30 + \frac{- 7 z}{3} + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 30 + \frac{- 7 z}{3} + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.1.4

Move the negative in front of the fraction.

$w = - 25 + 30 - \frac{7 z}{3} + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = - 25 + 30 - \frac{7 z}{3} + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.2

Add $- 25$ and $30$ .

$w = 5 - \frac{7 z}{3} + 3 z$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.3

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

$w = 5 - \frac{7 z}{3} + 3 z \cdot \frac{3}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.4

Simplify terms.

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Step 6.6.1.4.1

Combine $3 z$ and $\frac{3}{3}$ .

$w = 5 - \frac{7 z}{3} + \frac{3 z \cdot 3}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.4.2

Combine the numerators over the common denominator.

$w = 5 + \frac{- 7 z + 3 z \cdot 3}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = 5 + \frac{- 7 z + 3 z \cdot 3}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.5

Simplify each term.

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Step 6.6.1.5.1

Simplify the numerator.

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Step 6.6.1.5.1.1

Factor $z$ out of $- 7 z + 3 z \cdot 3$ .

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Step 6.6.1.5.1.1.1

Factor $z$ out of $- 7 z$ .

$w = 5 + \frac{z \cdot - 7 + 3 z \cdot 3}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.5.1.1.2

Factor $z$ out of $3 z \cdot 3$ .

$w = 5 + \frac{z \cdot - 7 + z (3 \cdot 3)}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.5.1.1.3

Factor $z$ out of $z \cdot - 7 + z (3 \cdot 3)$ .

$w = 5 + \frac{z (- 7 + 3 \cdot 3)}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = 5 + \frac{z (- 7 + 3 \cdot 3)}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.5.1.2

Multiply $3$ by $3$ .

$w = 5 + \frac{z (- 7 + 9)}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.5.1.3

Add $- 7$ and $9$ .

$w = 5 + \frac{z \cdot 2}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = 5 + \frac{z \cdot 2}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 6.6.1.5.2

Move $2$ to the left of $z$ .

$w = 5 + \frac{2 z}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = 5 + \frac{2 z}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = 5 + \frac{2 z}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = 5 + \frac{2 z}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = 5 + \frac{2 z}{3}$

$- \frac{35 z}{9} + 30 = 30$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 7

Solve for $z$ in $- \frac{35 z}{9} + 30 = 30$ .

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Step 7.1

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

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Step 7.1.1

Subtract $30$ from both sides of the equation.

$- \frac{35 z}{9} = 30 - 30$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 7.1.2

Subtract $30$ from $30$ .

$- \frac{35 z}{9} = 0$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$- \frac{35 z}{9} = 0$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 7.2

Set the numerator equal to zero.

$35 z = 0$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 7.3

Divide each term in $35 z = 0$ by $35$ and simplify.

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Step 7.3.1

Divide each term in $35 z = 0$ by $35$ .

$\frac{35 z}{35} = \frac{0}{35}$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 7.3.2

Simplify the left side.

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Step 7.3.2.1

Cancel the common factor of $35$ .

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Step 7.3.2.1.1

Cancel the common factor.

$\frac{35 z}{35} = \frac{0}{35}$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 7.3.2.1.2

Divide $z$ by $1$ .

$z = \frac{0}{35}$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$z = \frac{0}{35}$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$z = \frac{0}{35}$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 7.3.3

Simplify the right side.

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Step 7.3.3.1

Divide $0$ by $35$ .

$z = 0$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$z = 0$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$z = 0$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$z = 0$

$w = 5 + \frac{2 z}{3}$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 8

Replace all occurrences of $z$ with $0$ in each equation.

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Step 8.1

Replace all occurrences of $z$ in $w = 5 + \frac{2 z}{3}$ with $0$ .

$w = 5 + \frac{2 (0)}{3}$

$z = 0$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 8.2

Simplify the right side.

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Step 8.2.1

Simplify $5 + \frac{2 (0)}{3}$ .

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Step 8.2.1.1

Multiply $2$ by $0$ .

$w = 5 + \frac{0}{3}$

$z = 0$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 8.2.1.2

Divide $0$ by $3$ .

$w = 5 + 0$

$z = 0$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 8.2.1.3

Add $5$ and $0$ .

$w = 5$

$z = 0$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = 5$

$z = 0$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

$w = 5$

$z = 0$

$x = - \frac{8 z}{9} + 5$

$y = 10 - \frac{7 z}{9}$

Step 8.3

Replace all occurrences of $z$ in $x = - \frac{8 z}{9} + 5$ with $0$ .

$x = - \frac{8 (0)}{9} + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

Step 8.4

Simplify the right side.

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Step 8.4.1

Simplify $- \frac{8 (0)}{9} + 5$ .

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Step 8.4.1.1

Simplify each term.

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Step 8.4.1.1.1

Cancel the common factor of $0$ and $9$ .

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Step 8.4.1.1.1.1

Factor $9$ out of $8 (0)$ .

$x = - \frac{9 (8 \cdot (0))}{9} + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

Step 8.4.1.1.1.2

Cancel the common factors.

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Step 8.4.1.1.1.2.1

Factor $9$ out of $9$ .

$x = - \frac{9 (8 \cdot (0))}{9 (1)} + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

Step 8.4.1.1.1.2.2

Cancel the common factor.

$x = - \frac{9 (8 \cdot (0))}{9 \cdot 1} + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

Step 8.4.1.1.1.2.3

Rewrite the expression.

$x = - \frac{8 \cdot (0)}{1} + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

Step 8.4.1.1.1.2.4

Divide $8 \cdot (0)$ by $1$ .

$x = - (8 \cdot (0)) + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

$x = - (8 \cdot (0)) + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

$x = - (8 \cdot (0)) + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

Step 8.4.1.1.2

Multiply $- (8 \cdot (0))$ .

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Step 8.4.1.1.2.1

Multiply $8$ by $0$ .

$x = - 0 + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

Step 8.4.1.1.2.2

Multiply $- 1$ by $0$ .

$x = 0 + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

$x = 0 + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

$x = 0 + 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

Step 8.4.1.2

Add $0$ and $5$ .

$x = 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

$x = 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

$x = 5$

$w = 5$

$z = 0$

$y = 10 - \frac{7 z}{9}$

Step 8.5

Replace all occurrences of $z$ in $y = 10 - \frac{7 z}{9}$ with $0$ .

$y = 10 - \frac{7 (0)}{9}$

$x = 5$

$w = 5$

$z = 0$

Step 8.6

Simplify the right side.

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Step 8.6.1

Simplify $10 - \frac{7 (0)}{9}$ .

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Step 8.6.1.1

Simplify each term.

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Step 8.6.1.1.1

Cancel the common factor of $0$ and $9$ .

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Step 8.6.1.1.1.1

Factor $9$ out of $7 (0)$ .

$y = 10 - \frac{9 (7 \cdot (0))}{9}$

$x = 5$

$w = 5$

$z = 0$

Step 8.6.1.1.1.2

Cancel the common factors.

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Step 8.6.1.1.1.2.1

Factor $9$ out of $9$ .

$y = 10 - \frac{9 (7 \cdot (0))}{9 (1)}$

$x = 5$

$w = 5$

$z = 0$

Step 8.6.1.1.1.2.2

Cancel the common factor.

$y = 10 - \frac{9 (7 \cdot (0))}{9 \cdot 1}$

$x = 5$

$w = 5$

$z = 0$

Step 8.6.1.1.1.2.3

Rewrite the expression.

$y = 10 - \frac{7 \cdot (0)}{1}$

$x = 5$

$w = 5$

$z = 0$

Step 8.6.1.1.1.2.4

Divide $7 \cdot (0)$ by $1$ .

$y = 10 - (7 \cdot (0))$

$x = 5$

$w = 5$

$z = 0$

$y = 10 - (7 \cdot (0))$

$x = 5$

$w = 5$

$z = 0$

$y = 10 - (7 \cdot (0))$

$x = 5$

$w = 5$

$z = 0$

Step 8.6.1.1.2

Multiply $- (7 \cdot (0))$ .

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Step 8.6.1.1.2.1

Multiply $7$ by $0$ .

$y = 10 - 0$

$x = 5$

$w = 5$

$z = 0$

Step 8.6.1.1.2.2

Multiply $- 1$ by $0$ .

$y = 10 + 0$

$x = 5$

$w = 5$

$z = 0$

$y = 10 + 0$

$x = 5$

$w = 5$

$z = 0$

$y = 10 + 0$

$x = 5$

$w = 5$

$z = 0$

Step 8.6.1.2

Add $10$ and $0$ .

$y = 10$

$x = 5$

$w = 5$

$z = 0$

$y = 10$

$x = 5$

$w = 5$

$z = 0$

$y = 10$

$x = 5$

$w = 5$

$z = 0$

$y = 10$

$x = 5$

$w = 5$

$z = 0$

Step 9

List all of the solutions.

$y = 10, x = 5, w = 5, z = 0$