Finite Math Examples

$- 4 x - 8 y - 2 z - 6 w = - 5$ , $4 y + 24 z + 8 w = 32$ , $5 z + 5 w = 10$ , $- 4 w = - 12$

Step 1

Divide each term in $- 4 w = - 12$ by $- 4$ and simplify.

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Step 1.1

Divide each term in $- 4 w = - 12$ by $- 4$ .

$\frac{- 4 w}{- 4} = \frac{- 12}{- 4}$

$- 4 x - 8 y - 2 z - 6 w = - 5$

$4 y + 24 z + 8 w = 32$

$5 z + 5 w = 10$

Step 1.2

Simplify the left side.

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Step 1.2.1

Cancel the common factor of $- 4$ .

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Step 1.2.1.1

Cancel the common factor.

$\frac{- 4 w}{- 4} = \frac{- 12}{- 4}$

$- 4 x - 8 y - 2 z - 6 w = - 5$

$4 y + 24 z + 8 w = 32$

$5 z + 5 w = 10$

Step 1.2.1.2

Divide $w$ by $1$ .

$w = \frac{- 12}{- 4}$

$- 4 x - 8 y - 2 z - 6 w = - 5$

$4 y + 24 z + 8 w = 32$

$5 z + 5 w = 10$

$w = \frac{- 12}{- 4}$

$- 4 x - 8 y - 2 z - 6 w = - 5$

$4 y + 24 z + 8 w = 32$

$5 z + 5 w = 10$

$w = \frac{- 12}{- 4}$

$- 4 x - 8 y - 2 z - 6 w = - 5$

$4 y + 24 z + 8 w = 32$

$5 z + 5 w = 10$

Step 1.3

Simplify the right side.

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Step 1.3.1

Divide $- 12$ by $- 4$ .

$w = 3$

$- 4 x - 8 y - 2 z - 6 w = - 5$

$4 y + 24 z + 8 w = 32$

$5 z + 5 w = 10$

$w = 3$

$- 4 x - 8 y - 2 z - 6 w = - 5$

$4 y + 24 z + 8 w = 32$

$5 z + 5 w = 10$

$w = 3$

$- 4 x - 8 y - 2 z - 6 w = - 5$

$4 y + 24 z + 8 w = 32$

$5 z + 5 w = 10$

Step 2

Replace all occurrences of $w$ with $3$ in each equation.

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Step 2.1

Replace all occurrences of $w$ in $- 4 x - 8 y - 2 z - 6 w = - 5$ with $3$ .

$- 4 x - 8 y - 2 z - 6 \cdot 3 = - 5$

$w = 3$

$4 y + 24 z + 8 w = 32$

$5 z + 5 w = 10$

Step 2.2

Simplify the left side.

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Step 2.2.1

Multiply $- 6$ by $3$ .

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$4 y + 24 z + 8 w = 32$

$5 z + 5 w = 10$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$4 y + 24 z + 8 w = 32$

$5 z + 5 w = 10$

Step 2.3

Replace all occurrences of $w$ in $4 y + 24 z + 8 w = 32$ with $3$ .

$4 y + 24 z + 8 (3) = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$5 z + 5 w = 10$

Step 2.4

Simplify the left side.

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Step 2.4.1

Multiply $8$ by $3$ .

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$5 z + 5 w = 10$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$5 z + 5 w = 10$

Step 2.5

Replace all occurrences of $w$ in $5 z + 5 w = 10$ with $3$ .

$5 z + 5 (3) = 10$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 2.6

Simplify the left side.

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Step 2.6.1

Multiply $5$ by $3$ .

$5 z + 15 = 10$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$5 z + 15 = 10$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$5 z + 15 = 10$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 3

Solve for $z$ in $5 z + 15 = 10$ .

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Step 3.1

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

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Step 3.1.1

Subtract $15$ from both sides of the equation.

$5 z = 10 - 15$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 3.1.2

Subtract $15$ from $10$ .

$5 z = - 5$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$5 z = - 5$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 3.2

Divide each term in $5 z = - 5$ by $5$ and simplify.

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Step 3.2.1

Divide each term in $5 z = - 5$ by $5$ .

$\frac{5 z}{5} = \frac{- 5}{5}$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Cancel the common factor of $5$ .

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Step 3.2.2.1.1

Cancel the common factor.

$\frac{5 z}{5} = \frac{- 5}{5}$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 3.2.2.1.2

Divide $z$ by $1$ .

$z = \frac{- 5}{5}$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$z = \frac{- 5}{5}$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$z = \frac{- 5}{5}$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 3.2.3

Simplify the right side.

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Step 3.2.3.1

Divide $- 5$ by $5$ .

$z = - 1$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$z = - 1$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$z = - 1$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$z = - 1$

$4 y + 24 z + 24 = 32$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 4

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

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Step 4.1

Replace all occurrences of $z$ in $4 y + 24 z + 24 = 32$ with $- 1$ .

$4 y + 24 (- 1) + 24 = 32$

$z = - 1$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 4.2

Simplify the left side.

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Step 4.2.1

Simplify $4 y + 24 (- 1) + 24$ .

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Step 4.2.1.1

Multiply $24$ by $- 1$ .

$4 y - 24 + 24 = 32$

$z = - 1$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 4.2.1.2

Combine the opposite terms in $4 y - 24 + 24$ .

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Step 4.2.1.2.1

Add $- 24$ and $24$ .

$4 y + 0 = 32$

$z = - 1$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 4.2.1.2.2

Add $4 y$ and $0$ .

$4 y = 32$

$z = - 1$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$4 y = 32$

$z = - 1$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$4 y = 32$

$z = - 1$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

$4 y = 32$

$z = - 1$

$- 4 x - 8 y - 2 z - 18 = - 5$

$w = 3$

Step 4.3

Replace all occurrences of $z$ in $- 4 x - 8 y - 2 z - 18 = - 5$ with $- 1$ .

$- 4 x - 8 y - 2 \cdot - 1 - 18 = - 5$

$4 y = 32$

$z = - 1$

$w = 3$

Step 4.4

Simplify the left side.

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Step 4.4.1

Simplify $- 4 x - 8 y - 2 \cdot - 1 - 18$ .

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Step 4.4.1.1

Multiply $- 2$ by $- 1$ .

$- 4 x - 8 y + 2 - 18 = - 5$

$4 y = 32$

$z = - 1$

$w = 3$

Step 4.4.1.2

Subtract $18$ from $2$ .

$- 4 x - 8 y - 16 = - 5$

$4 y = 32$

$z = - 1$

$w = 3$

$- 4 x - 8 y - 16 = - 5$

$4 y = 32$

$z = - 1$

$w = 3$

$- 4 x - 8 y - 16 = - 5$

$4 y = 32$

$z = - 1$

$w = 3$

$- 4 x - 8 y - 16 = - 5$

$4 y = 32$

$z = - 1$

$w = 3$

Step 5

Divide each term in $4 y = 32$ by $4$ and simplify.

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Step 5.1

Divide each term in $4 y = 32$ by $4$ .

$\frac{4 y}{4} = \frac{32}{4}$

$- 4 x - 8 y - 16 = - 5$

$z = - 1$

$w = 3$

Step 5.2

Simplify the left side.

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Step 5.2.1

Cancel the common factor of $4$ .

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Step 5.2.1.1

Cancel the common factor.

$\frac{4 y}{4} = \frac{32}{4}$

$- 4 x - 8 y - 16 = - 5$

$z = - 1$

$w = 3$

Step 5.2.1.2

Divide $y$ by $1$ .

$y = \frac{32}{4}$

$- 4 x - 8 y - 16 = - 5$

$z = - 1$

$w = 3$

$y = \frac{32}{4}$

$- 4 x - 8 y - 16 = - 5$

$z = - 1$

$w = 3$

$y = \frac{32}{4}$

$- 4 x - 8 y - 16 = - 5$

$z = - 1$

$w = 3$

Step 5.3

Simplify the right side.

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Step 5.3.1

Divide $32$ by $4$ .

$y = 8$

$- 4 x - 8 y - 16 = - 5$

$z = - 1$

$w = 3$

$y = 8$

$- 4 x - 8 y - 16 = - 5$

$z = - 1$

$w = 3$

$y = 8$

$- 4 x - 8 y - 16 = - 5$

$z = - 1$

$w = 3$

Step 6

Replace all occurrences of $y$ with $8$ in each equation.

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Step 6.1

Replace all occurrences of $y$ in $- 4 x - 8 y - 16 = - 5$ with $8$ .

$- 4 x - 8 \cdot 8 - 16 = - 5$

$y = 8$

$z = - 1$

$w = 3$

Step 6.2

Simplify the left side.

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Step 6.2.1

Simplify $- 4 x - 8 \cdot 8 - 16$ .

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Step 6.2.1.1

Multiply $- 8$ by $8$ .

$- 4 x - 64 - 16 = - 5$

$y = 8$

$z = - 1$

$w = 3$

Step 6.2.1.2

Subtract $16$ from $- 64$ .

$- 4 x - 80 = - 5$

$y = 8$

$z = - 1$

$w = 3$

$- 4 x - 80 = - 5$

$y = 8$

$z = - 1$

$w = 3$

$- 4 x - 80 = - 5$

$y = 8$

$z = - 1$

$w = 3$

$- 4 x - 80 = - 5$

$y = 8$

$z = - 1$

$w = 3$

Step 7

Solve for $x$ in $- 4 x - 80 = - 5$ .

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Step 7.1

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

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Step 7.1.1

Add $80$ to both sides of the equation.

$- 4 x = - 5 + 80$

$y = 8$

$z = - 1$

$w = 3$

Step 7.1.2

Add $- 5$ and $80$ .

$- 4 x = 75$

$y = 8$

$z = - 1$

$w = 3$

$- 4 x = 75$

$y = 8$

$z = - 1$

$w = 3$

Step 7.2

Divide each term in $- 4 x = 75$ by $- 4$ and simplify.

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Step 7.2.1

Divide each term in $- 4 x = 75$ by $- 4$ .

$\frac{- 4 x}{- 4} = \frac{75}{- 4}$

$y = 8$

$z = - 1$

$w = 3$

Step 7.2.2

Simplify the left side.

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Step 7.2.2.1

Cancel the common factor of $- 4$ .

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Step 7.2.2.1.1

Cancel the common factor.

$\frac{- 4 x}{- 4} = \frac{75}{- 4}$

$y = 8$

$z = - 1$

$w = 3$

Step 7.2.2.1.2

Divide $x$ by $1$ .

$x = \frac{75}{- 4}$

$y = 8$

$z = - 1$

$w = 3$

$x = \frac{75}{- 4}$

$y = 8$

$z = - 1$

$w = 3$

$x = \frac{75}{- 4}$

$y = 8$

$z = - 1$

$w = 3$

Step 7.2.3

Simplify the right side.

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Step 7.2.3.1

Move the negative in front of the fraction.

$x = - \frac{75}{4}$

$y = 8$

$z = - 1$

$w = 3$

$x = - \frac{75}{4}$

$y = 8$

$z = - 1$

$w = 3$

$x = - \frac{75}{4}$

$y = 8$

$z = - 1$

$w = 3$

$x = - \frac{75}{4}$

$y = 8$

$z = - 1$

$w = 3$

Step 8

Solve the system of equations.

$x = - \frac{75}{4} y = 8 z = - 1 w = 3$

Step 9

List all of the solutions.

$x = - \frac{75}{4}, y = 8, z = - 1, w = 3$