Finite Math Examples

$- 8 x - y + 3 z = 28$ , $- 7 y + 7 z = 42$ , $6 x + 2 y + 3 z = - 9$

Step 1

Solve for $x$ in $- 8 x - y + 3 z = 28$ .

Tap for more steps...

Step 1.1

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

Tap for more steps...

Step 1.1.1

Add $y$ to both sides of the equation.

$- 8 x + 3 z = 28 + y$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 1.1.2

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

$- 8 x = 28 + y - 3 z$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

$- 8 x = 28 + y - 3 z$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 1.2

Divide each term in $- 8 x = 28 + y - 3 z$ by $- 8$ and simplify.

Tap for more steps...

Step 1.2.1

Divide each term in $- 8 x = 28 + y - 3 z$ by $- 8$ .

$\frac{- 8 x}{- 8} = \frac{28}{- 8} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 1.2.2

Simplify the left side.

Tap for more steps...

Step 1.2.2.1

Cancel the common factor of $- 8$ .

Tap for more steps...

Step 1.2.2.1.1

Cancel the common factor.

$\frac{- 8 x}{- 8} = \frac{28}{- 8} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 1.2.2.1.2

Divide $x$ by $1$ .

$x = \frac{28}{- 8} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

$x = \frac{28}{- 8} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

$x = \frac{28}{- 8} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 1.2.3

Simplify the right side.

Tap for more steps...

Step 1.2.3.1

Simplify each term.

Tap for more steps...

Step 1.2.3.1.1

Cancel the common factor of $28$ and $- 8$ .

Tap for more steps...

Step 1.2.3.1.1.1

Factor $4$ out of $28$ .

$x = \frac{4 (7)}{- 8} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 1.2.3.1.1.2

Cancel the common factors.

Tap for more steps...

Step 1.2.3.1.1.2.1

Factor $4$ out of $- 8$ .

$x = \frac{4 \cdot 7}{4 \cdot - 2} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 1.2.3.1.1.2.2

Cancel the common factor.

$x = \frac{4 \cdot 7}{4 \cdot - 2} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 1.2.3.1.1.2.3

Rewrite the expression.

$x = \frac{7}{- 2} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

$x = \frac{7}{- 2} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

$x = \frac{7}{- 2} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 1.2.3.1.2

Move the negative in front of the fraction.

$x = - \frac{7}{2} + \frac{y}{- 8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 1.2.3.1.3

Move the negative in front of the fraction.

$x = - \frac{7}{2} - \frac{y}{8} + \frac{- 3 z}{- 8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 1.2.3.1.4

Dividing two negative values results in a positive value.

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$6 x + 2 y + 3 z = - 9$

Step 2

Replace all occurrences of $x$ with $- \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$ in each equation.

Tap for more steps...

Step 2.1

Replace all occurrences of $x$ in $6 x + 2 y + 3 z = - 9$ with $- \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$ .

$6 (- \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2

Simplify the left side.

Tap for more steps...

Step 2.2.1

Simplify $6 (- \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}) + 2 y + 3 z$ .

Tap for more steps...

Step 2.2.1.1

Simplify each term.

Tap for more steps...

Step 2.2.1.1.1

Apply the distributive property.

$6 (- \frac{7}{2}) + 6 (- \frac{y}{8}) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2

Simplify.

Tap for more steps...

Step 2.2.1.1.2.1

Cancel the common factor of $2$ .

Tap for more steps...

Step 2.2.1.1.2.1.1

Move the leading negative in $- \frac{7}{2}$ into the numerator.

$6 (\frac{- 7}{2}) + 6 (- \frac{y}{8}) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.1.2

Factor $2$ out of $6$ .

$2 (3) (\frac{- 7}{2}) + 6 (- \frac{y}{8}) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.1.3

Cancel the common factor.

$2 \cdot (3 (\frac{- 7}{2})) + 6 (- \frac{y}{8}) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.1.4

Rewrite the expression.

$3 \cdot - 7 + 6 (- \frac{y}{8}) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$3 \cdot - 7 + 6 (- \frac{y}{8}) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.2

Multiply $3$ by $- 7$ .

$- 21 + 6 (- \frac{y}{8}) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.3

Cancel the common factor of $2$ .

Tap for more steps...

Step 2.2.1.1.2.3.1

Move the leading negative in $- \frac{y}{8}$ into the numerator.

$- 21 + 6 (\frac{- y}{8}) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.3.2

Factor $2$ out of $6$ .

$- 21 + 2 (3) (\frac{- y}{8}) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.3.3

Factor $2$ out of $8$ .

$- 21 + 2 \cdot (3 (\frac{- y}{2 \cdot 4})) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.3.4

Cancel the common factor.

$- 21 + 2 \cdot (3 (\frac{- y}{2 \cdot 4})) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.3.5

Rewrite the expression.

$- 21 + 3 (\frac{- y}{4}) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$- 21 + 3 (\frac{- y}{4}) + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.4

Combine $3$ and $\frac{- y}{4}$ .

$- 21 + \frac{3 (- y)}{4} + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.5

Multiply $- 1$ by $3$ .

$- 21 + \frac{- 3 y}{4} + 6 (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.6

Cancel the common factor of $2$ .

Tap for more steps...

Step 2.2.1.1.2.6.1

Factor $2$ out of $6$ .

$- 21 + \frac{- 3 y}{4} + 2 (3) (\frac{3 z}{8}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.6.2

Factor $2$ out of $8$ .

$- 21 + \frac{- 3 y}{4} + 2 \cdot (3 (\frac{3 z}{2 \cdot 4})) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.6.3

Cancel the common factor.

$- 21 + \frac{- 3 y}{4} + 2 \cdot (3 (\frac{3 z}{2 \cdot 4})) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.6.4

Rewrite the expression.

$- 21 + \frac{- 3 y}{4} + 3 (\frac{3 z}{4}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$- 21 + \frac{- 3 y}{4} + 3 (\frac{3 z}{4}) + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.7

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

$- 21 + \frac{- 3 y}{4} + \frac{3 (3 z)}{4} + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.2.8

Multiply $3$ by $3$ .

$- 21 + \frac{- 3 y}{4} + \frac{9 z}{4} + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$- 21 + \frac{- 3 y}{4} + \frac{9 z}{4} + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.1.3

Move the negative in front of the fraction.

$- 21 - \frac{3 y}{4} + \frac{9 z}{4} + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$- 21 - \frac{3 y}{4} + \frac{9 z}{4} + 2 y + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.2

To write $2 y$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$- 21 + \frac{9 z}{4} - \frac{3 y}{4} + 2 y \cdot \frac{4}{4} + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.3

Combine $2 y$ and $\frac{4}{4}$ .

$- 21 + \frac{9 z}{4} - \frac{3 y}{4} + \frac{2 y \cdot 4}{4} + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.4

Combine the numerators over the common denominator.

$- 21 + \frac{9 z}{4} + \frac{- 3 y + 2 y \cdot 4}{4} + 3 z = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.5

Combine the numerators over the common denominator.

$- 21 + 3 z + \frac{9 z - 3 y + 2 y \cdot 4}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.6

Multiply $4$ by $2$ .

$- 21 + 3 z + \frac{9 z - 3 y + 8 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.7

Add $- 3 y$ and $8 y$ .

$- 21 + 3 z + \frac{9 z + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.8

To write $- 21$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$3 z - 21 \cdot \frac{4}{4} + \frac{9 z + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.9

Combine $- 21$ and $\frac{4}{4}$ .

$3 z + \frac{- 21 \cdot 4}{4} + \frac{9 z + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.10

Combine the numerators over the common denominator.

$3 z + \frac{- 21 \cdot 4 + 9 z + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.11

Multiply $- 21$ by $4$ .

$3 z + \frac{- 84 + 9 z + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.12

To write $3 z$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$3 z \cdot \frac{4}{4} + \frac{- 84 + 9 z + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.13

Simplify terms.

Tap for more steps...

Step 2.2.1.13.1

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

$\frac{3 z \cdot 4}{4} + \frac{- 84 + 9 z + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.13.2

Combine the numerators over the common denominator.

$\frac{3 z \cdot 4 - 84 + 9 z + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$\frac{3 z \cdot 4 - 84 + 9 z + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.14

Simplify the numerator.

Tap for more steps...

Step 2.2.1.14.1

Multiply $4$ by $3$ .

$\frac{12 z - 84 + 9 z + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 2.2.1.14.2

Add $12 z$ and $9 z$ .

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$- 7 y + 7 z = 42$

Step 3

Solve for $y$ in $- 7 y + 7 z = 42$ .

Tap for more steps...

Step 3.1

Subtract $7 z$ from both sides of the equation.

$- 7 y = 42 - 7 z$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 3.2

Divide each term in $- 7 y = 42 - 7 z$ by $- 7$ and simplify.

Tap for more steps...

Step 3.2.1

Divide each term in $- 7 y = 42 - 7 z$ by $- 7$ .

$\frac{- 7 y}{- 7} = \frac{42}{- 7} + \frac{- 7 z}{- 7}$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 3.2.2

Simplify the left side.

Tap for more steps...

Step 3.2.2.1

Cancel the common factor of $- 7$ .

Tap for more steps...

Step 3.2.2.1.1

Cancel the common factor.

$\frac{- 7 y}{- 7} = \frac{42}{- 7} + \frac{- 7 z}{- 7}$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 3.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{42}{- 7} + \frac{- 7 z}{- 7}$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$y = \frac{42}{- 7} + \frac{- 7 z}{- 7}$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$y = \frac{42}{- 7} + \frac{- 7 z}{- 7}$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 3.2.3

Simplify the right side.

Tap for more steps...

Step 3.2.3.1

Simplify each term.

Tap for more steps...

Step 3.2.3.1.1

Divide $42$ by $- 7$ .

$y = - 6 + \frac{- 7 z}{- 7}$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 3.2.3.1.2

Cancel the common factor of $- 7$ .

Tap for more steps...

Step 3.2.3.1.2.1

Cancel the common factor.

$y = - 6 + \frac{- 7 z}{- 7}$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 3.2.3.1.2.2

Divide $z$ by $1$ .

$y = - 6 + z$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$y = - 6 + z$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$y = - 6 + z$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$y = - 6 + z$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$y = - 6 + z$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$y = - 6 + z$

$\frac{21 z - 84 + 5 y}{4} = - 9$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4

Replace all occurrences of $y$ with $- 6 + z$ in each equation.

Tap for more steps...

Step 4.1

Replace all occurrences of $y$ in $\frac{21 z - 84 + 5 y}{4} = - 9$ with $- 6 + z$ .

$\frac{21 z - 84 + 5 (- 6 + z)}{4} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4.2

Simplify the left side.

Tap for more steps...

Step 4.2.1

Simplify $\frac{21 z - 84 + 5 (- 6 + z)}{4}$ .

Tap for more steps...

Step 4.2.1.1

Simplify the numerator.

Tap for more steps...

Step 4.2.1.1.1

Apply the distributive property.

$\frac{21 z - 84 + 5 \cdot - 6 + 5 z}{4} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4.2.1.1.2

Multiply $5$ by $- 6$ .

$\frac{21 z - 84 - 30 + 5 z}{4} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4.2.1.1.3

Add $21 z$ and $5 z$ .

$\frac{26 z - 84 - 30}{4} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4.2.1.1.4

Subtract $30$ from $- 84$ .

$\frac{26 z - 114}{4} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4.2.1.1.5

Factor $2$ out of $26 z - 114$ .

Tap for more steps...

Step 4.2.1.1.5.1

Factor $2$ out of $26 z$ .

$\frac{2 (13 z) - 114}{4} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4.2.1.1.5.2

Factor $2$ out of $- 114$ .

$\frac{2 (13 z) + 2 (- 57)}{4} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4.2.1.1.5.3

Factor $2$ out of $2 (13 z) + 2 (- 57)$ .

$\frac{2 (13 z - 57)}{4} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$\frac{2 (13 z - 57)}{4} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$\frac{2 (13 z - 57)}{4} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4.2.1.2

Cancel the common factors.

Tap for more steps...

Step 4.2.1.2.1

Factor $2$ out of $4$ .

$\frac{2 (13 z - 57)}{2 \cdot 2} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4.2.1.2.2

Cancel the common factor.

$\frac{2 (13 z - 57)}{2 \cdot 2} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4.2.1.2.3

Rewrite the expression.

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$

Step 4.3

Replace all occurrences of $y$ in $x = - \frac{7}{2} - \frac{y}{8} + \frac{3 z}{8}$ with $- 6 + z$ .

$x = - \frac{7}{2} - \frac{- 6 + z}{8} + \frac{3 z}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4

Simplify the right side.

Tap for more steps...

Step 4.4.1

Simplify $- \frac{7}{2} - \frac{- 6 + z}{8} + \frac{3 z}{8}$ .

Tap for more steps...

Step 4.4.1.1

Combine the numerators over the common denominator.

$x = \frac{- 7}{2} + \frac{- (- 6 + z) + 3 z}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.2

Simplify each term.

Tap for more steps...

Step 4.4.1.2.1

Apply the distributive property.

$x = \frac{- 7}{2} + \frac{6 - z + 3 z}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.2.2

Multiply $- 1$ by $- 6$ .

$x = \frac{- 7}{2} + \frac{6 - z + 3 z}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = \frac{- 7}{2} + \frac{6 - z + 3 z}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.3

Add $- z$ and $3 z$ .

$x = \frac{- 7}{2} + \frac{6 + 2 z}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.4

Simplify each term.

Tap for more steps...

Step 4.4.1.4.1

Move the negative in front of the fraction.

$x = - \frac{7}{2} + \frac{6 + 2 z}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.4.2

Cancel the common factor of $6 + 2 z$ and $8$ .

Tap for more steps...

Step 4.4.1.4.2.1

Factor $2$ out of $6$ .

$x = - \frac{7}{2} + \frac{2 \cdot 3 + 2 z}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.4.2.2

Factor $2$ out of $2 z$ .

$x = - \frac{7}{2} + \frac{2 \cdot 3 + 2 (z)}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.4.2.3

Factor $2$ out of $2 \cdot 3 + 2 (z)$ .

$x = - \frac{7}{2} + \frac{2 \cdot (3 + z)}{8}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.4.2.4

Cancel the common factors.

Tap for more steps...

Step 4.4.1.4.2.4.1

Factor $2$ out of $8$ .

$x = - \frac{7}{2} + \frac{2 \cdot (3 + z)}{2 (4)}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.4.2.4.2

Cancel the common factor.

$x = - \frac{7}{2} + \frac{2 \cdot (3 + z)}{2 \cdot 4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.4.2.4.3

Rewrite the expression.

$x = - \frac{7}{2} + \frac{3 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} + \frac{3 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} + \frac{3 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{7}{2} + \frac{3 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.5

To write $- \frac{7}{2}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$x = - \frac{7}{2} \cdot \frac{2}{2} + \frac{3 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.6

Write each expression with a common denominator of $4$ , by multiplying each by an appropriate factor of $1$ .

Tap for more steps...

Step 4.4.1.6.1

Multiply $\frac{7}{2}$ by $\frac{2}{2}$ .

$x = - \frac{7 \cdot 2}{2 \cdot 2} + \frac{3 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.6.2

Multiply $2$ by $2$ .

$x = - \frac{7 \cdot 2}{4} + \frac{3 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{7 \cdot 2}{4} + \frac{3 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.7

Combine the numerators over the common denominator.

$x = \frac{- 7 \cdot 2 + 3 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.8

Simplify the numerator.

Tap for more steps...

Step 4.4.1.8.1

Multiply $- 7$ by $2$ .

$x = \frac{- 14 + 3 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.8.2

Add $- 14$ and $3$ .

$x = \frac{- 11 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = \frac{- 11 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.9

Simplify with factoring out.

Tap for more steps...

Step 4.4.1.9.1

Rewrite $- 11$ as $- 1 (11)$ .

$x = \frac{- 1 \cdot 11 + z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.9.2

Factor $- 1$ out of $z$ .

$x = \frac{- 1 \cdot 11 - 1 (- z)}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.9.3

Factor $- 1$ out of $- 1 (11) - 1 (- z)$ .

$x = \frac{- 1 (11 - z)}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 4.4.1.9.4

Move the negative in front of the fraction.

$x = - \frac{11 - z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{11 - z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{11 - z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{11 - z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

$x = - \frac{11 - z}{4}$

$\frac{13 z - 57}{2} = - 9$

$y = - 6 + z$

Step 5

Solve for $z$ in $\frac{13 z - 57}{2} = - 9$ .

Tap for more steps...

Step 5.1

Multiply both sides by $2$ .

$\frac{13 z - 57}{2} \cdot 2 = - 9 \cdot 2$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

Step 5.2

Simplify.

Tap for more steps...

Step 5.2.1

Simplify the left side.

Tap for more steps...

Step 5.2.1.1

Cancel the common factor of $2$ .

Tap for more steps...

Step 5.2.1.1.1

Cancel the common factor.

$\frac{13 z - 57}{2} \cdot 2 = - 9 \cdot 2$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

Step 5.2.1.1.2

Rewrite the expression.

$13 z - 57 = - 9 \cdot 2$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

$13 z - 57 = - 9 \cdot 2$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

$13 z - 57 = - 9 \cdot 2$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

Step 5.2.2

Simplify the right side.

Tap for more steps...

Step 5.2.2.1

Multiply $- 9$ by $2$ .

$13 z - 57 = - 18$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

$13 z - 57 = - 18$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

$13 z - 57 = - 18$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

Step 5.3

Solve for $z$ .

Tap for more steps...

Step 5.3.1

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

Tap for more steps...

Step 5.3.1.1

Add $57$ to both sides of the equation.

$13 z = - 18 + 57$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

Step 5.3.1.2

Add $- 18$ and $57$ .

$13 z = 39$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

$13 z = 39$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

Step 5.3.2

Divide each term in $13 z = 39$ by $13$ and simplify.

Tap for more steps...

Step 5.3.2.1

Divide each term in $13 z = 39$ by $13$ .

$\frac{13 z}{13} = \frac{39}{13}$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

Step 5.3.2.2

Simplify the left side.

Tap for more steps...

Step 5.3.2.2.1

Cancel the common factor of $13$ .

Tap for more steps...

Step 5.3.2.2.1.1

Cancel the common factor.

$\frac{13 z}{13} = \frac{39}{13}$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

Step 5.3.2.2.1.2

Divide $z$ by $1$ .

$z = \frac{39}{13}$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

$z = \frac{39}{13}$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

$z = \frac{39}{13}$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

Step 5.3.2.3

Simplify the right side.

Tap for more steps...

Step 5.3.2.3.1

Divide $39$ by $13$ .

$z = 3$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

$z = 3$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

$z = 3$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

$z = 3$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

$z = 3$

$x = - \frac{11 - z}{4}$

$y = - 6 + z$

Step 6

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

Tap for more steps...

Step 6.1

Replace all occurrences of $z$ in $x = - \frac{11 - z}{4}$ with $3$ .

$x = - \frac{11 - (3)}{4}$

$z = 3$

$y = - 6 + z$

Step 6.2

Simplify the right side.

Tap for more steps...

Step 6.2.1

Simplify $- \frac{11 - (3)}{4}$ .

Tap for more steps...

Step 6.2.1.1

Simplify the numerator.

Tap for more steps...

Step 6.2.1.1.1

Multiply $- 1$ by $3$ .

$x = - \frac{11 - 3}{4}$

$z = 3$

$y = - 6 + z$

Step 6.2.1.1.2

Subtract $3$ from $11$ .

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

$z = 3$

$y = - 6 + z$

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

$z = 3$

$y = - 6 + z$

Step 6.2.1.2

Simplify the expression.

Tap for more steps...

Step 6.2.1.2.1

Divide $8$ by $4$ .

$x = - 1 \cdot 2$

$z = 3$

$y = - 6 + z$

Step 6.2.1.2.2

Multiply $- 1$ by $2$ .

$x = - 2$

$z = 3$

$y = - 6 + z$

$x = - 2$

$z = 3$

$y = - 6 + z$

$x = - 2$

$z = 3$

$y = - 6 + z$

$x = - 2$

$z = 3$

$y = - 6 + z$

Step 6.3

Replace all occurrences of $z$ in $y = - 6 + z$ with $3$ .

$y = - 6 + 3$

$x = - 2$

$z = 3$

Step 6.4

Simplify $y = - 6 + 3$ .

Tap for more steps...

Step 6.4.1

Simplify the left side.

Tap for more steps...

Step 6.4.1.1

Remove parentheses.

$y = - 6 + 3$

$x = - 2$

$z = 3$

$y = - 6 + 3$

$x = - 2$

$z = 3$

Step 6.4.2

Simplify the right side.

Tap for more steps...

Step 6.4.2.1

Add $- 6$ and $3$ .

$y = - 3$

$x = - 2$

$z = 3$

$y = - 3$

$x = - 2$

$z = 3$

$y = - 3$

$x = - 2$

$z = 3$

$y = - 3$

$x = - 2$

$z = 3$

Step 7

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

$(- 2, - 3, 3)$

Step 8

The result can be shown in multiple forms.

Point Form:

$(- 2, - 3, 3)$

Equation Form:

$x = - 2, y = - 3, z = 3$