Finite Math Examples

$x + y - z = - 5$ , $4 x - y + z = - 5$ , $x - 3 y + 2 z = - 10$

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.

$x - z = - 5 - y$

$4 x - y + z = - 5$

$x - 3 y + 2 z = - 10$

Step 1.2

Add $z$ to both sides of the equation.

$x = - 5 - y + z$

$4 x - y + z = - 5$

$x - 3 y + 2 z = - 10$

$x = - 5 - y + z$

$4 x - y + z = - 5$

$x - 3 y + 2 z = - 10$

Step 2

Replace all occurrences of $x$ with $- 5 - y + z$ in each equation.

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Step 2.1

Replace all occurrences of $x$ in $4 x - y + z = - 5$ with $- 5 - y + z$ .

$4 (- 5 - y + z) - y + z = - 5$

$x = - 5 - y + z$

$x - 3 y + 2 z = - 10$

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify $4 (- 5 - y + z) - y + z$ .

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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.

$4 \cdot - 5 + 4 (- y) + 4 z - y + z = - 5$

$x = - 5 - y + z$

$x - 3 y + 2 z = - 10$

Step 2.2.1.1.2

Simplify.

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Step 2.2.1.1.2.1

Multiply $4$ by $- 5$ .

$- 20 + 4 (- y) + 4 z - y + z = - 5$

$x = - 5 - y + z$

$x - 3 y + 2 z = - 10$

Step 2.2.1.1.2.2

Multiply $- 1$ by $4$ .

$- 20 - 4 y + 4 z - y + z = - 5$

$x = - 5 - y + z$

$x - 3 y + 2 z = - 10$

$- 20 - 4 y + 4 z - y + z = - 5$

$x = - 5 - y + z$

$x - 3 y + 2 z = - 10$

$- 20 - 4 y + 4 z - y + z = - 5$

$x = - 5 - y + z$

$x - 3 y + 2 z = - 10$

Step 2.2.1.2

Simplify by adding terms.

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Step 2.2.1.2.1

Subtract $y$ from $- 4 y$ .

$- 20 - 5 y + 4 z + z = - 5$

$x = - 5 - y + z$

$x - 3 y + 2 z = - 10$

Step 2.2.1.2.2

Add $4 z$ and $z$ .

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

$x = - 5 - y + z$

$x - 3 y + 2 z = - 10$

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

$x = - 5 - y + z$

$x - 3 y + 2 z = - 10$

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

$x = - 5 - y + z$

$x - 3 y + 2 z = - 10$

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

$x = - 5 - y + z$

$x - 3 y + 2 z = - 10$

Step 2.3

Replace all occurrences of $x$ in $x - 3 y + 2 z = - 10$ with $- 5 - y + z$ .

$(- 5 - y + z) - 3 y + 2 z = - 10$

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

$x = - 5 - y + z$

Step 2.4

Simplify the left side.

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Step 2.4.1

Simplify $(- 5 - y + z) - 3 y + 2 z$ .

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Step 2.4.1.1

Subtract $3 y$ from $- y$ .

$- 5 - 4 y + z + 2 z = - 10$

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

$x = - 5 - y + z$

Step 2.4.1.2

Add $z$ and $2 z$ .

$- 5 - 4 y + 3 z = - 10$

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

$x = - 5 - y + z$

$- 5 - 4 y + 3 z = - 10$

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

$x = - 5 - y + z$

$- 5 - 4 y + 3 z = - 10$

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

$x = - 5 - y + z$

$- 5 - 4 y + 3 z = - 10$

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

$x = - 5 - y + z$

Step 3

Solve for $y$ in $- 5 - 4 y + 3 z = - 10$ .

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Step 3.1

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

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Step 3.1.1

Add $5$ to both sides of the equation.

$- 4 y + 3 z = - 10 + 5$

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

$x = - 5 - y + z$

Step 3.1.2

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

$- 4 y = - 10 + 5 - 3 z$

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

$x = - 5 - y + z$

Step 3.1.3

Add $- 10$ and $5$ .

$- 4 y = - 5 - 3 z$

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

$x = - 5 - y + z$

$- 4 y = - 5 - 3 z$

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

$x = - 5 - y + z$

Step 3.2

Divide each term in $- 4 y = - 5 - 3 z$ by $- 4$ and simplify.

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Step 3.2.1

Divide each term in $- 4 y = - 5 - 3 z$ by $- 4$ .

$\frac{- 4 y}{- 4} = \frac{- 5}{- 4} + \frac{- 3 z}{- 4}$

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

$x = - 5 - y + z$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Cancel the common factor of $- 4$ .

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Step 3.2.2.1.1

Cancel the common factor.

$\frac{- 4 y}{- 4} = \frac{- 5}{- 4} + \frac{- 3 z}{- 4}$

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

$x = - 5 - y + z$

Step 3.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{- 5}{- 4} + \frac{- 3 z}{- 4}$

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

$x = - 5 - y + z$

$y = \frac{- 5}{- 4} + \frac{- 3 z}{- 4}$

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

$x = - 5 - y + z$

$y = \frac{- 5}{- 4} + \frac{- 3 z}{- 4}$

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

$x = - 5 - y + z$

Step 3.2.3

Simplify the right side.

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Step 3.2.3.1

Simplify each term.

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Step 3.2.3.1.1

Dividing two negative values results in a positive value.

$y = \frac{5}{4} + \frac{- 3 z}{- 4}$

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

$x = - 5 - y + z$

Step 3.2.3.1.2

Dividing two negative values results in a positive value.

$y = \frac{5}{4} + \frac{3 z}{4}$

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

$x = - 5 - y + z$

$y = \frac{5}{4} + \frac{3 z}{4}$

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

$x = - 5 - y + z$

$y = \frac{5}{4} + \frac{3 z}{4}$

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

$x = - 5 - y + z$

$y = \frac{5}{4} + \frac{3 z}{4}$

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

$x = - 5 - y + z$

$y = \frac{5}{4} + \frac{3 z}{4}$

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

$x = - 5 - y + z$

Step 4

Replace all occurrences of $y$ with $\frac{5}{4} + \frac{3 z}{4}$ in each equation.

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Step 4.1

Replace all occurrences of $y$ in $- 20 - 5 y + 5 z = - 5$ with $\frac{5}{4} + \frac{3 z}{4}$ .

$- 20 - 5 (\frac{5}{4} + \frac{3 z}{4}) + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2

Simplify the left side.

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Step 4.2.1

Simplify $- 20 - 5 (\frac{5}{4} + \frac{3 z}{4}) + 5 z$ .

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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.

$- 20 - 5 (\frac{5}{4}) - 5 \frac{3 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.1.2

Multiply $- 5 (\frac{5}{4})$ .

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Step 4.2.1.1.2.1

Combine $- 5$ and $\frac{5}{4}$ .

$- 20 + \frac{- 5 \cdot 5}{4} - 5 \frac{3 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.1.2.2

Multiply $- 5$ by $5$ .

$- 20 + \frac{- 25}{4} - 5 \frac{3 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

$- 20 + \frac{- 25}{4} - 5 \frac{3 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.1.3

Multiply $- 5 \frac{3 z}{4}$ .

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Step 4.2.1.1.3.1

Combine $- 5$ and $\frac{3 z}{4}$ .

$- 20 + \frac{- 25}{4} + \frac{- 5 (3 z)}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.1.3.2

Multiply $3$ by $- 5$ .

$- 20 + \frac{- 25}{4} + \frac{- 15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

$- 20 + \frac{- 25}{4} + \frac{- 15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.1.4

Simplify each term.

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Step 4.2.1.1.4.1

Move the negative in front of the fraction.

$- 20 - \frac{25}{4} + \frac{- 15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.1.4.2

Move the negative in front of the fraction.

$- 20 - \frac{25}{4} - \frac{15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

$- 20 - \frac{25}{4} - \frac{15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

$- 20 - \frac{25}{4} - \frac{15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.2

To write $- 20$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$- 20 \cdot \frac{4}{4} - \frac{25}{4} - \frac{15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.3

Combine $- 20$ and $\frac{4}{4}$ .

$\frac{- 20 \cdot 4}{4} - \frac{25}{4} - \frac{15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.4

Combine the numerators over the common denominator.

$\frac{- 20 \cdot 4 - 25}{4} - \frac{15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.5

Simplify the numerator.

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Step 4.2.1.5.1

Multiply $- 20$ by $4$ .

$\frac{- 80 - 25}{4} - \frac{15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.5.2

Subtract $25$ from $- 80$ .

$\frac{- 105}{4} - \frac{15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

$\frac{- 105}{4} - \frac{15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.6

Move the negative in front of the fraction.

$- \frac{105}{4} - \frac{15 z}{4} + 5 z = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.7

To write $5 z$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$- \frac{105}{4} - \frac{15 z}{4} + 5 z \cdot \frac{4}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.8

Combine $5 z$ and $\frac{4}{4}$ .

$- \frac{105}{4} - \frac{15 z}{4} + \frac{5 z \cdot 4}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.9

Combine the numerators over the common denominator.

$- \frac{105}{4} + \frac{- 15 z + 5 z \cdot 4}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.10

Combine the numerators over the common denominator.

$\frac{- 105 - 15 z + 5 z \cdot 4}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.11

Multiply $4$ by $5$ .

$\frac{- 105 - 15 z + 20 z}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.12

Add $- 15 z$ and $20 z$ .

$\frac{- 105 + 5 z}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.13

Factor $5$ out of $- 105 + 5 z$ .

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Step 4.2.1.13.1

Factor $5$ out of $- 105$ .

$\frac{5 \cdot - 21 + 5 z}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.13.2

Factor $5$ out of $5 \cdot - 21 + 5 z$ .

$\frac{5 (- 21 + z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

$\frac{5 (- 21 + z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.14

Rewrite $- 21$ as $- 1 (21)$ .

$\frac{5 (- 1 \cdot 21 + z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.15

Factor $- 1$ out of $z$ .

$\frac{5 (- 1 \cdot 21 - 1 (- z))}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.16

Factor $- 1$ out of $- 1 (21) - 1 (- z)$ .

$\frac{5 (- 1 (21 - z))}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.2.1.17

Move the negative in front of the fraction.

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 5 - y + z$

Step 4.3

Replace all occurrences of $y$ in $x = - 5 - y + z$ with $\frac{5}{4} + \frac{3 z}{4}$ .

$x = - 5 - (\frac{5}{4} + \frac{3 z}{4}) + z$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4

Simplify the right side.

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Step 4.4.1

Simplify $- 5 - (\frac{5}{4} + \frac{3 z}{4}) + z$ .

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Step 4.4.1.1

Apply the distributive property.

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

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.2

To write $- 5$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

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

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.3

Combine $- 5$ and $\frac{4}{4}$ .

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

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.4

Combine the numerators over the common denominator.

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

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.5

Simplify the numerator.

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Step 4.4.1.5.1

Multiply $- 5$ by $4$ .

$x = \frac{- 20 - 5}{4} - \frac{3 z}{4} + z$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.5.2

Subtract $5$ from $- 20$ .

$x = \frac{- 25}{4} - \frac{3 z}{4} + z$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = \frac{- 25}{4} - \frac{3 z}{4} + z$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.6

Move the negative in front of the fraction.

$x = - \frac{25}{4} - \frac{3 z}{4} + z$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.7

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

$x = - \frac{25}{4} - \frac{3 z}{4} + z \cdot \frac{4}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.8

Simplify terms.

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Step 4.4.1.8.1

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

$x = - \frac{25}{4} - \frac{3 z}{4} + \frac{z \cdot 4}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.8.2

Combine the numerators over the common denominator.

$x = - \frac{25}{4} + \frac{- 3 z + z \cdot 4}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.8.3

Combine the numerators over the common denominator.

$x = \frac{- 25 - 3 z + z \cdot 4}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = \frac{- 25 - 3 z + z \cdot 4}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.9

Move $4$ to the left of $z$ .

$x = \frac{- 25 - 3 z + 4 z}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.10

Simplify terms.

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Step 4.4.1.10.1

Add $- 3 z$ and $4 z$ .

$x = \frac{- 25 + z}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.10.2

Rewrite $- 25$ as $- 1 (25)$ .

$x = \frac{- 1 \cdot 25 + z}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.10.3

Factor $- 1$ out of $z$ .

$x = \frac{- 1 \cdot 25 - 1 (- z)}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.10.4

Factor $- 1$ out of $- 1 (25) - 1 (- z)$ .

$x = \frac{- 1 (25 - z)}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 4.4.1.10.5

Move the negative in front of the fraction.

$x = - \frac{25 - z}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - \frac{25 - z}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - \frac{25 - z}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - \frac{25 - z}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - \frac{25 - z}{4}$

$- \frac{5 (21 - z)}{4} = - 5$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5

Solve for $z$ in $- \frac{5 (21 - z)}{4} = - 5$ .

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Step 5.1

Multiply both sides of the equation by $- \frac{4}{5}$ .

$- \frac{4}{5} \cdot (- \frac{5 (21 - z)}{4}) = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2

Simplify both sides of the equation.

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Step 5.2.1

Simplify the left side.

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Step 5.2.1.1

Simplify $- \frac{4}{5} (- \frac{5 (21 - z)}{4})$ .

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Step 5.2.1.1.1

Cancel the common factor of $4$ .

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Step 5.2.1.1.1.1

Move the leading negative in $- \frac{4}{5}$ into the numerator.

$\frac{- 4}{5} \cdot (- \frac{5 (21 - z)}{4}) = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.1.1.1.2

Move the leading negative in $- \frac{5 (21 - z)}{4}$ into the numerator.

$\frac{- 4}{5} \cdot \frac{- 5 (21 - z)}{4} = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.1.1.1.3

Factor $4$ out of $- 4$ .

$\frac{4 (- 1)}{5} \cdot \frac{- 5 (21 - z)}{4} = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.1.1.1.4

Cancel the common factor.

$\frac{4 \cdot - 1}{5} \cdot \frac{- 5 (21 - z)}{4} = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.1.1.1.5

Rewrite the expression.

$\frac{- 1}{5} \cdot (- 5 (21 - z)) = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$\frac{- 1}{5} \cdot (- 5 (21 - z)) = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.1.1.2

Cancel the common factor of $5$ .

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Step 5.2.1.1.2.1

Factor $5$ out of $- 5 (21 - z)$ .

$\frac{- 1}{5} \cdot (5 (- (21 - z))) = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.1.1.2.2

Cancel the common factor.

$\frac{- 1}{5} \cdot (5 (- (21 - z))) = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.1.1.2.3

Rewrite the expression.

$21 - z = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$21 - z = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.1.1.3

Multiply.

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Step 5.2.1.1.3.1

Multiply $- 1$ by $- 1$ .

$1 (21 - z) = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.1.1.3.2

Multiply $21 - z$ by $1$ .

$21 - z = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$21 - z = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$21 - z = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$21 - z = - \frac{4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.2

Simplify the right side.

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Step 5.2.2.1

Simplify $- \frac{4}{5} \cdot - 5$ .

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Step 5.2.2.1.1

Cancel the common factor of $5$ .

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Step 5.2.2.1.1.1

Move the leading negative in $- \frac{4}{5}$ into the numerator.

$21 - z = \frac{- 4}{5} \cdot - 5$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.2.1.1.2

Factor $5$ out of $- 5$ .

$21 - z = \frac{- 4}{5} \cdot (5 (- 1))$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.2.1.1.3

Cancel the common factor.

$21 - z = \frac{- 4}{5} \cdot (5 \cdot - 1)$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.2.1.1.4

Rewrite the expression.

$21 - z = - 4 \cdot - 1$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$21 - z = - 4 \cdot - 1$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.2.2.1.2

Multiply $- 4$ by $- 1$ .

$21 - z = 4$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$21 - z = 4$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$21 - z = 4$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$21 - z = 4$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.3

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

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Step 5.3.1

Subtract $21$ from both sides of the equation.

$- z = 4 - 21$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.3.2

Subtract $21$ from $4$ .

$- z = - 17$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$- z = - 17$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.4

Divide each term in $- z = - 17$ by $- 1$ and simplify.

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Step 5.4.1

Divide each term in $- z = - 17$ by $- 1$ .

$\frac{- z}{- 1} = \frac{- 17}{- 1}$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.4.2

Simplify the left side.

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Step 5.4.2.1

Dividing two negative values results in a positive value.

$\frac{z}{1} = \frac{- 17}{- 1}$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.4.2.2

Divide $z$ by $1$ .

$z = \frac{- 17}{- 1}$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$z = \frac{- 17}{- 1}$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 5.4.3

Simplify the right side.

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Step 5.4.3.1

Divide $- 17$ by $- 1$ .

$z = 17$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$z = 17$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$z = 17$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

$z = 17$

$x = - \frac{25 - z}{4}$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 6

Replace all occurrences of $z$ with $17$ in each equation.

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Step 6.1

Replace all occurrences of $z$ in $x = - \frac{25 - z}{4}$ with $17$ .

$x = - \frac{25 - (17)}{4}$

$z = 17$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 6.2

Simplify the right side.

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Step 6.2.1

Simplify $- \frac{25 - (17)}{4}$ .

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Step 6.2.1.1

Simplify the numerator.

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Step 6.2.1.1.1

Multiply $- 1$ by $17$ .

$x = - \frac{25 - 17}{4}$

$z = 17$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 6.2.1.1.2

Subtract $17$ from $25$ .

$x = - \frac{8}{4}$

$z = 17$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - \frac{8}{4}$

$z = 17$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 6.2.1.2

Simplify the expression.

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Step 6.2.1.2.1

Divide $8$ by $4$ .

$x = - 1 \cdot 2$

$z = 17$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 6.2.1.2.2

Multiply $- 1$ by $2$ .

$x = - 2$

$z = 17$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 2$

$z = 17$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 2$

$z = 17$

$y = \frac{5}{4} + \frac{3 z}{4}$

$x = - 2$

$z = 17$

$y = \frac{5}{4} + \frac{3 z}{4}$

Step 6.3

Replace all occurrences of $z$ in $y = \frac{5}{4} + \frac{3 z}{4}$ with $17$ .

$y = \frac{5}{4} + \frac{3 (17)}{4}$

$x = - 2$

$z = 17$

Step 6.4

Simplify the right side.

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Step 6.4.1

Simplify $\frac{5}{4} + \frac{3 (17)}{4}$ .

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Step 6.4.1.1

Combine the numerators over the common denominator.

$y = \frac{5 + 3 (17)}{4}$

$x = - 2$

$z = 17$

Step 6.4.1.2

Simplify the expression.

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Step 6.4.1.2.1

Multiply $3$ by $17$ .

$y = \frac{5 + 51}{4}$

$x = - 2$

$z = 17$

Step 6.4.1.2.2

Add $5$ and $51$ .

$y = \frac{56}{4}$

$x = - 2$

$z = 17$

Step 6.4.1.2.3

Divide $56$ by $4$ .

$y = 14$

$x = - 2$

$z = 17$

$y = 14$

$x = - 2$

$z = 17$

$y = 14$

$x = - 2$

$z = 17$

$y = 14$

$x = - 2$

$z = 17$

$y = 14$

$x = - 2$

$z = 17$

Step 7

The solution to the system is the complete set of ordered pairs that are valid solutions.

$(- 2, 14, 17)$

Step 8

The result can be shown in multiple forms.

Point Form:

$(- 2, 14, 17)$

Equation Form:

$x = - 2, y = 14, z = 17$