Linear Algebra Examples

$[\begin{array}{c} - \frac{1}{2} & \frac{3}{10} & \frac{3}{5} \\ 0 & - \frac{2}{5} & \frac{1}{5} \\ \frac{1}{2} & - \frac{1}{10} & - \frac{1}{5} \end{array}] [\begin{array}{c} x \\ y \\ z \end{array}] = [\begin{array}{c} 18 \\ 5 \\ 9 \end{array}]$

Step 1

Multiply $[\begin{array}{c} - \frac{1}{2} & \frac{3}{10} & \frac{3}{5} \\ 0 & - \frac{2}{5} & \frac{1}{5} \\ \frac{1}{2} & - \frac{1}{10} & - \frac{1}{5} \end{array}] [\begin{array}{c} x \\ y \\ z \end{array}]$ .

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Step 1.1

Two matrices can be multiplied if and only if the number of columns in the first matrix is equal to the number of rows in the second matrix. In this case, the first matrix is $3 \times 3$ and the second matrix is $3 \times 1$ .

Step 1.2

Multiply each row in the first matrix by each column in the second matrix.

$[\begin{array}{c} - \frac{1}{2} x + \frac{3}{10} y + \frac{3}{5} z \\ 0 x - \frac{2}{5} y + \frac{1}{5} z \\ \frac{1}{2} x - \frac{1}{10} y - \frac{1}{5} z \end{array}] = [\begin{array}{c} 18 \\ 5 \\ 9 \end{array}]$

Step 1.3

Simplify each element of the matrix by multiplying out all the expressions.

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Step 1.3.1

Combine $\frac{1}{2}$ and $x$ .

$[\begin{array}{c} - \frac{x}{2} + \frac{3 y}{10} + \frac{3 z}{5} \\ - \frac{2 y}{5} + \frac{z}{5} \\ \frac{x}{2} - \frac{1}{10} y - \frac{1}{5} z \end{array}] = [\begin{array}{c} 18 \\ 5 \\ 9 \end{array}]$

Step 1.3.2

Combine $y$ and $\frac{1}{10}$ .

$[\begin{array}{c} - \frac{x}{2} + \frac{3 y}{10} + \frac{3 z}{5} \\ - \frac{2 y}{5} + \frac{z}{5} \\ \frac{x}{2} - \frac{y}{10} - \frac{1}{5} z \end{array}] = [\begin{array}{c} 18 \\ 5 \\ 9 \end{array}]$

Step 1.3.3

Combine $z$ and $\frac{1}{5}$ .

$[\begin{array}{c} - \frac{x}{2} + \frac{3 y}{10} + \frac{3 z}{5} \\ - \frac{2 y}{5} + \frac{z}{5} \\ \frac{x}{2} - \frac{y}{10} - \frac{z}{5} \end{array}] = [\begin{array}{c} 18 \\ 5 \\ 9 \end{array}]$

Step 2

Write as a linear system of equations.

$- \frac{x}{2} + \frac{3 y}{10} + \frac{3 z}{5} = 18$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3

Solve the system of equations.

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Step 3.1

Solve for $x$ in $- \frac{x}{2} + \frac{3 y}{10} + \frac{3 z}{5} = 18$ .

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Step 3.1.1

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

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Step 3.1.1.1

Subtract $\frac{3 y}{10}$ from both sides of the equation.

$- \frac{x}{2} + \frac{3 z}{5} = 18 - \frac{3 y}{10}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.1.2

Subtract $\frac{3 z}{5}$ from both sides of the equation.

$- \frac{x}{2} = 18 - \frac{3 y}{10} - \frac{3 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$- \frac{x}{2} = 18 - \frac{3 y}{10} - \frac{3 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.2

Multiply both sides of the equation by $- 2$ .

$- 2 (- \frac{x}{2}) = - 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3

Simplify both sides of the equation.

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Step 3.1.3.1

Simplify the left side.

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Step 3.1.3.1.1

Simplify $- 2 (- \frac{x}{2})$ .

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Step 3.1.3.1.1.1

Cancel the common factor of $2$ .

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Step 3.1.3.1.1.1.1

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

$- 2 \frac{- x}{2} = - 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.1.1.1.2

Factor $2$ out of $- 2$ .

$2 (- 1) (\frac{- x}{2}) = - 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.1.1.1.3

Cancel the common factor.

$2 \cdot (- 1 \frac{- x}{2}) = - 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.1.1.1.4

Rewrite the expression.

$x = - 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.1.1.2

Multiply.

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Step 3.1.3.1.1.2.1

Multiply $- 1$ by $- 1$ .

$1 x = - 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.1.1.2.2

Multiply $x$ by $1$ .

$x = - 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2

Simplify the right side.

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Step 3.1.3.2.1

Simplify $- 2 (18 - \frac{3 y}{10} - \frac{3 z}{5})$ .

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Step 3.1.3.2.1.1

Apply the distributive property.

$x = - 2 \cdot 18 - 2 (- \frac{3 y}{10}) - 2 (- \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.2

Simplify.

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Step 3.1.3.2.1.2.1

Multiply $- 2$ by $18$ .

$x = - 36 - 2 (- \frac{3 y}{10}) - 2 (- \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.2.2

Cancel the common factor of $2$ .

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Step 3.1.3.2.1.2.2.1

Move the leading negative in $- \frac{3 y}{10}$ into the numerator.

$x = - 36 - 2 \frac{- 3 y}{10} - 2 (- \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.2.2.2

Factor $2$ out of $- 2$ .

$x = - 36 + 2 (- 1) (\frac{- 3 y}{10}) - 2 (- \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.2.2.3

Factor $2$ out of $10$ .

$x = - 36 + 2 \cdot (- 1 \frac{- 3 y}{2 \cdot 5}) - 2 (- \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.2.2.4

Cancel the common factor.

$x = - 36 + 2 \cdot (- 1 \frac{- 3 y}{2 \cdot 5}) - 2 (- \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.2.2.5

Rewrite the expression.

$x = - 36 - \frac{- 3 y}{5} - 2 (- \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 36 - \frac{- 3 y}{5} - 2 (- \frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.2.3

Multiply $- 2 (- \frac{3 z}{5})$ .

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Step 3.1.3.2.1.2.3.1

Multiply $- 1$ by $- 2$ .

$x = - 36 - \frac{- 3 y}{5} + 2 (\frac{3 z}{5})$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.2.3.2

Combine $2$ and $\frac{3 z}{5}$ .

$x = - 36 - \frac{- 3 y}{5} + \frac{2 (3 z)}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.2.3.3

Multiply $3$ by $2$ .

$x = - 36 - \frac{- 3 y}{5} + \frac{6 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 36 - \frac{- 3 y}{5} + \frac{6 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 36 - \frac{- 3 y}{5} + \frac{6 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.3

Simplify each term.

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Step 3.1.3.2.1.3.1

Move the negative in front of the fraction.

$x = - 36 + \frac{3 y}{5} + \frac{6 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.3.2

Multiply $- - \frac{3 y}{5}$ .

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Step 3.1.3.2.1.3.2.1

Multiply $- 1$ by $- 1$ .

$x = - 36 + 1 (\frac{3 y}{5}) + \frac{6 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.3.2.1.3.2.2

Multiply $\frac{3 y}{5}$ by $1$ .

$x = - 36 + \frac{3 y}{5} + \frac{6 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 36 + \frac{3 y}{5} + \frac{6 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 36 + \frac{3 y}{5} + \frac{6 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 36 + \frac{3 y}{5} + \frac{6 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 36 + \frac{3 y}{5} + \frac{6 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = - 36 + \frac{3 y}{5} + \frac{6 z}{5}$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.1.4

Move $- 36$ .

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$

Step 3.2

Replace all occurrences of $x$ with $\frac{3 y}{5} + \frac{6 z}{5} - 36$ in each equation.

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Step 3.2.1

Replace all occurrences of $x$ in $\frac{x}{2} - \frac{y}{10} - \frac{z}{5} = 9$ with $\frac{3 y}{5} + \frac{6 z}{5} - 36$ .

$\frac{\frac{3 y}{5} + \frac{6 z}{5} - 36}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Simplify $\frac{\frac{3 y}{5} + \frac{6 z}{5} - 36}{2} - \frac{y}{10} - \frac{z}{5}$ .

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Step 3.2.2.1.1

Simplify each term.

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Step 3.2.2.1.1.1

Simplify the numerator.

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Step 3.2.2.1.1.1.1

Combine the numerators over the common denominator.

$\frac{\frac{3 y + 6 z}{5} - 36}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.1.2

Factor $3$ out of $3 y + 6 z$ .

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Step 3.2.2.1.1.1.2.1

Factor $3$ out of $3 y$ .

$\frac{\frac{3 (y) + 6 z}{5} - 36}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.1.2.2

Factor $3$ out of $6 z$ .

$\frac{\frac{3 (y) + 3 (2 z)}{5} - 36}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.1.2.3

Factor $3$ out of $3 (y) + 3 (2 z)$ .

$\frac{\frac{3 (y + 2 z)}{5} - 36}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{\frac{3 (y + 2 z)}{5} - 36}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.1.3

To write $- 36$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$\frac{\frac{3 (y + 2 z)}{5} - 36 \cdot \frac{5}{5}}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.1.4

Combine $- 36$ and $\frac{5}{5}$ .

$\frac{\frac{3 (y + 2 z)}{5} + \frac{- 36 \cdot 5}{5}}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.1.5

Combine the numerators over the common denominator.

$\frac{\frac{3 (y + 2 z) - 36 \cdot 5}{5}}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.1.6

Simplify the numerator.

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Step 3.2.2.1.1.1.6.1

Factor $3$ out of $3 (y + 2 z) - 36 \cdot 5$ .

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Step 3.2.2.1.1.1.6.1.1

Factor $3$ out of $- 36 \cdot 5$ .

$\frac{\frac{3 (y + 2 z) + 3 (- 12 \cdot 5)}{5}}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.1.6.1.2

Factor $3$ out of $3 (y + 2 z) + 3 (- 12 \cdot 5)$ .

$\frac{\frac{3 (y + 2 z - 12 \cdot 5)}{5}}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{\frac{3 (y + 2 z - 12 \cdot 5)}{5}}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.1.6.2

Multiply $- 12$ by $5$ .

$\frac{\frac{3 (y + 2 z - 60)}{5}}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{\frac{3 (y + 2 z - 60)}{5}}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{\frac{3 (y + 2 z - 60)}{5}}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.2

Multiply the numerator by the reciprocal of the denominator.

$\frac{3 (y + 2 z - 60)}{5} \cdot \frac{1}{2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.3

Multiply $\frac{3 (y + 2 z - 60)}{5} \cdot \frac{1}{2}$ .

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Step 3.2.2.1.1.3.1

Multiply $\frac{3 (y + 2 z - 60)}{5}$ by $\frac{1}{2}$ .

$\frac{3 (y + 2 z - 60)}{5 \cdot 2} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.1.3.2

Multiply $5$ by $2$ .

$\frac{3 (y + 2 z - 60)}{10} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{3 (y + 2 z - 60)}{10} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{3 (y + 2 z - 60)}{10} - \frac{y}{10} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.2

Combine the numerators over the common denominator.

$\frac{3 (y + 2 z - 60) - y}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.3

Simplify each term.

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Step 3.2.2.1.3.1

Apply the distributive property.

$\frac{3 y + 3 (2 z) + 3 \cdot - 60 - y}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.3.2

Simplify.

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Step 3.2.2.1.3.2.1

Multiply $2$ by $3$ .

$\frac{3 y + 6 z + 3 \cdot - 60 - y}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.3.2.2

Multiply $3$ by $- 60$ .

$\frac{3 y + 6 z - 180 - y}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{3 y + 6 z - 180 - y}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{3 y + 6 z - 180 - y}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.4

Subtract $y$ from $3 y$ .

$\frac{2 y + 6 z - 180}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.5

Simplify each term.

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Step 3.2.2.1.5.1

Cancel the common factor of $2 y + 6 z - 180$ and $10$ .

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Step 3.2.2.1.5.1.1

Factor $2$ out of $2 y$ .

$\frac{2 (y) + 6 z - 180}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.5.1.2

Factor $2$ out of $6 z$ .

$\frac{2 (y) + 2 (3 z) - 180}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.5.1.3

Factor $2$ out of $2 (y) + 2 (3 z)$ .

$\frac{2 (y + 3 z) - 180}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.5.1.4

Factor $2$ out of $- 180$ .

$\frac{2 (y + 3 z) + 2 \cdot - 90}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.5.1.5

Factor $2$ out of $2 (y + 3 z) + 2 \cdot - 90$ .

$\frac{2 (y + 3 z - 90)}{10} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.5.1.6

Cancel the common factors.

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Step 3.2.2.1.5.1.6.1

Factor $2$ out of $10$ .

$\frac{2 (y + 3 z - 90)}{2 (5)} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.5.1.6.2

Cancel the common factor.

$\frac{2 (y + 3 z - 90)}{2 \cdot 5} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.5.1.6.3

Rewrite the expression.

$\frac{y + 3 z - 90}{5} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{y + 3 z - 90}{5} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{y + 3 z - 90}{5} + \frac{- z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.5.2

Move the negative in front of the fraction.

$\frac{y + 3 z - 90}{5} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{y + 3 z - 90}{5} - \frac{z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.6

Simplify terms.

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Step 3.2.2.1.6.1

Combine the numerators over the common denominator.

$\frac{y + 3 z - 90 - z}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.2.2.1.6.2

Subtract $z$ from $3 z$ .

$\frac{y + 2 z - 90}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{y + 2 z - 90}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{y + 2 z - 90}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{y + 2 z - 90}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$\frac{y + 2 z - 90}{5} = 9$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.3

Solve for $y$ in $\frac{y + 2 z - 90}{5} = 9$ .

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Step 3.3.1

Multiply both sides by $5$ .

$\frac{y + 2 z - 90}{5} \cdot 5 = 9 \cdot 5$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.3.2

Simplify.

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Step 3.3.2.1

Simplify the left side.

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Step 3.3.2.1.1

Cancel the common factor of $5$ .

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Step 3.3.2.1.1.1

Cancel the common factor.

$\frac{y + 2 z - 90}{5} \cdot 5 = 9 \cdot 5$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.3.2.1.1.2

Rewrite the expression.

$y + 2 z - 90 = 9 \cdot 5$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$y + 2 z - 90 = 9 \cdot 5$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$y + 2 z - 90 = 9 \cdot 5$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.3.2.2

Simplify the right side.

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Step 3.3.2.2.1

Multiply $9$ by $5$ .

$y + 2 z - 90 = 45$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$y + 2 z - 90 = 45$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$y + 2 z - 90 = 45$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.3.3

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

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Step 3.3.3.1

Subtract $2 z$ from both sides of the equation.

$y - 90 = 45 - 2 z$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.3.3.2

Add $90$ to both sides of the equation.

$y = 45 - 2 z + 90$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.3.3.3

Add $45$ and $90$ .

$y = - 2 z + 135$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$y = - 2 z + 135$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$y = - 2 z + 135$

$x = \frac{3 y}{5} + \frac{6 z}{5} - 36$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.4

Replace all occurrences of $y$ with $- 2 z + 135$ in each equation.

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Step 3.4.1

Replace all occurrences of $y$ in $x = \frac{3 y}{5} + \frac{6 z}{5} - 36$ with $- 2 z + 135$ .

$x = \frac{3 (- 2 z + 135)}{5} + \frac{6 z}{5} - 36$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.4.2

Simplify the right side.

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Step 3.4.2.1

Simplify $\frac{3 (- 2 z + 135)}{5} + \frac{6 z}{5} - 36$ .

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Step 3.4.2.1.1

Combine the numerators over the common denominator.

$x = - 36 + \frac{3 (- 2 z + 135) + 6 z}{5}$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.4.2.1.2

Simplify each term.

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Step 3.4.2.1.2.1

Apply the distributive property.

$x = - 36 + \frac{3 (- 2 z) + 3 \cdot 135 + 6 z}{5}$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.4.2.1.2.2

Multiply $- 2$ by $3$ .

$x = - 36 + \frac{- 6 z + 3 \cdot 135 + 6 z}{5}$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.4.2.1.2.3

Multiply $3$ by $135$ .

$x = - 36 + \frac{- 6 z + 405 + 6 z}{5}$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$x = - 36 + \frac{- 6 z + 405 + 6 z}{5}$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.4.2.1.3

Simplify by adding terms.

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Step 3.4.2.1.3.1

Combine the opposite terms in $- 6 z + 405 + 6 z$ .

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Step 3.4.2.1.3.1.1

Add $- 6 z$ and $6 z$ .

$x = - 36 + \frac{0 + 405}{5}$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.4.2.1.3.1.2

Add $0$ and $405$ .

$x = - 36 + \frac{405}{5}$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$x = - 36 + \frac{405}{5}$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.4.2.1.3.2

Simplify the expression.

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Step 3.4.2.1.3.2.1

Divide $405$ by $5$ .

$x = - 36 + 81$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.4.2.1.3.2.2

Add $- 36$ and $81$ .

$x = 45$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$x = 45$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$x = 45$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$x = 45$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

$x = 45$

$y = - 2 z + 135$

$- \frac{2 y}{5} + \frac{z}{5} = 5$

Step 3.4.3

Replace all occurrences of $y$ in $- \frac{2 y}{5} + \frac{z}{5} = 5$ with $- 2 z + 135$ .

$- \frac{2 (- 2 z + 135)}{5} + \frac{z}{5} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4

Simplify the left side.

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Step 3.4.4.1

Simplify $- \frac{2 (- 2 z + 135)}{5} + \frac{z}{5}$ .

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Step 3.4.4.1.1

Combine the numerators over the common denominator.

$\frac{- 2 (- 2 z + 135) + z}{5} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4.1.2

Simplify each term.

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Step 3.4.4.1.2.1

Apply the distributive property.

$\frac{- 2 (- 2 z) - 2 \cdot 135 + z}{5} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4.1.2.2

Multiply $- 2$ by $- 2$ .

$\frac{4 z - 2 \cdot 135 + z}{5} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4.1.2.3

Multiply $- 2$ by $135$ .

$\frac{4 z - 270 + z}{5} = 5$

$x = 45$

$y = - 2 z + 135$

$\frac{4 z - 270 + z}{5} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4.1.3

Simplify terms.

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Step 3.4.4.1.3.1

Add $4 z$ and $z$ .

$\frac{5 z - 270}{5} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4.1.3.2

Cancel the common factor of $5 z - 270$ and $5$ .

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Step 3.4.4.1.3.2.1

Factor $5$ out of $5 z$ .

$\frac{5 (z) - 270}{5} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4.1.3.2.2

Factor $5$ out of $- 270$ .

$\frac{5 (z) + 5 \cdot - 54}{5} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4.1.3.2.3

Factor $5$ out of $5 (z) + 5 (- 54)$ .

$\frac{5 (z - 54)}{5} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4.1.3.2.4

Cancel the common factors.

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Step 3.4.4.1.3.2.4.1

Factor $5$ out of $5$ .

$\frac{5 (z - 54)}{5 (1)} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4.1.3.2.4.2

Cancel the common factor.

$\frac{5 (z - 54)}{5 \cdot 1} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4.1.3.2.4.3

Rewrite the expression.

$\frac{z - 54}{1} = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.4.4.1.3.2.4.4

Divide $z - 54$ by $1$ .

$z - 54 = 5$

$x = 45$

$y = - 2 z + 135$

$z - 54 = 5$

$x = 45$

$y = - 2 z + 135$

$z - 54 = 5$

$x = 45$

$y = - 2 z + 135$

$z - 54 = 5$

$x = 45$

$y = - 2 z + 135$

$z - 54 = 5$

$x = 45$

$y = - 2 z + 135$

$z - 54 = 5$

$x = 45$

$y = - 2 z + 135$

$z - 54 = 5$

$x = 45$

$y = - 2 z + 135$

Step 3.5

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

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Step 3.5.1

Add $54$ to both sides of the equation.

$z = 5 + 54$

$x = 45$

$y = - 2 z + 135$

Step 3.5.2

Add $5$ and $54$ .

$z = 59$

$x = 45$

$y = - 2 z + 135$

$z = 59$

$x = 45$

$y = - 2 z + 135$

Step 3.6

Replace all occurrences of $z$ with $59$ in each equation.

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Step 3.6.1

Replace all occurrences of $z$ in $y = - 2 z + 135$ with $59$ .

$y = - 2 \cdot 59 + 135$

$z = 59$

$x = 45$

Step 3.6.2

Simplify the right side.

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Step 3.6.2.1

Simplify $- 2 \cdot 59 + 135$ .

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Step 3.6.2.1.1

Multiply $- 2$ by $59$ .

$y = - 118 + 135$

$z = 59$

$x = 45$

Step 3.6.2.1.2

Add $- 118$ and $135$ .

$y = 17$

$z = 59$

$x = 45$

$y = 17$

$z = 59$

$x = 45$

$y = 17$

$z = 59$

$x = 45$

$y = 17$

$z = 59$

$x = 45$

Step 3.7

List all of the solutions.

$y = 17, z = 59, x = 45$