Linear Algebra Examples

$x + 3 y + 2 z = 1$ , $2 x + 4 y + (k - 1) z = 3$ , $x + k y + (k - 3) z = k + 1$

Step 1

Simplify each term.

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Step 1.1

Apply the distributive property.

$x + 3 y + 2 z = 1, 2 x + 4 y + k z - 1 z = 3, x + k y + (k - 3) z = k + 1$

Step 1.2

Rewrite $- 1 z$ as $- z$ .

$x + 3 y + 2 z = 1, 2 x + 4 y + k z - z = 3, x + k y + (k - 3) z = k + 1$

Step 2

Apply the distributive property.

$x + 3 y + 2 z = 1, 2 x + 4 y + k z - z = 3, x + k y + k z - 3 z = k + 1$

Step 3

Subtract $k$ from both sides of the equation.

$x + 3 y + 2 z = 1, 2 x + 4 y + k z - z = 3, x + k y + k z - 3 z - k = 1$

Step 4

Write the system of equations in matrix form.

$[\begin{array}{c} 0 & 1 & 3 & 2 & 1 \\ z & 2 & 4 & - 1 & 3 \\ - 1 & 1 & 0 & - 3 & 1 \end{array}]$

Step 5

Find the reduced row echelon form.

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Step 5.1

Swap $R_{2}$ with $R_{1}$ to put a nonzero entry at $1, 1$ .

$[\begin{array}{c} z & 2 & 4 & - 1 & 3 \\ 0 & 1 & 3 & 2 & 1 \\ - 1 & 1 & 0 & - 3 & 1 \end{array}]$

Step 5.2

Multiply each element of $R_{1}$ by $\frac{1}{z}$ to make the entry at $1, 1$ a $1$ .

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Step 5.2.1

Multiply each element of $R_{1}$ by $\frac{1}{z}$ to make the entry at $1, 1$ a $1$ .

$[\begin{array}{c} \frac{z}{z} & \frac{2}{z} & \frac{4}{z} & \frac{- 1}{z} & \frac{3}{z} \\ 0 & 1 & 3 & 2 & 1 \\ - 1 & 1 & 0 & - 3 & 1 \end{array}]$

Step 5.2.2

Simplify $R_{1}$ .

$[\begin{array}{c} 1 & \frac{2}{z} & \frac{4}{z} & - \frac{1}{z} & \frac{3}{z} \\ 0 & 1 & 3 & 2 & 1 \\ - 1 & 1 & 0 & - 3 & 1 \end{array}]$

Step 5.3

Perform the row operation $R_{3} = R_{3} + R_{1}$ to make the entry at $3, 1$ a $0$ .

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Step 5.3.1

Perform the row operation $R_{3} = R_{3} + R_{1}$ to make the entry at $3, 1$ a $0$ .

$[\begin{array}{c} 1 & \frac{2}{z} & \frac{4}{z} & - \frac{1}{z} & \frac{3}{z} \\ 0 & 1 & 3 & 2 & 1 \\ - 1 + 1 \cdot 1 & 1 + \frac{2}{z} & 0 + \frac{4}{z} & - 3 - \frac{1}{z} & 1 + \frac{3}{z} \end{array}]$

Step 5.3.2

Simplify $R_{3}$ .

$[\begin{array}{c} 1 & \frac{2}{z} & \frac{4}{z} & - \frac{1}{z} & \frac{3}{z} \\ 0 & 1 & 3 & 2 & 1 \\ 0 & 1 + \frac{2}{z} & \frac{4}{z} & - 3 - \frac{1}{z} & 1 + \frac{3}{z} \end{array}]$

Step 5.4

Perform the row operation $R_{3} = R_{3} - (1 + \frac{2}{z}) R_{2}$ to make the entry at $3, 2$ a $0$ .

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Step 5.4.1

Perform the row operation $R_{3} = R_{3} - (1 + \frac{2}{z}) R_{2}$ to make the entry at $3, 2$ a $0$ .

$[\begin{array}{c} 1 & \frac{2}{z} & \frac{4}{z} & - \frac{1}{z} & \frac{3}{z} \\ 0 & 1 & 3 & 2 & 1 \\ 0 - (1 + \frac{2}{z}) \cdot 0 & 1 + \frac{2}{z} - (1 + \frac{2}{z}) \cdot 1 & \frac{4}{z} - (1 + \frac{2}{z}) \cdot 3 & - 3 - \frac{1}{z} - (1 + \frac{2}{z}) \cdot 2 & 1 + \frac{3}{z} - (1 + \frac{2}{z}) \cdot 1 \end{array}]$

Step 5.4.2

Simplify $R_{3}$ .

$[\begin{array}{c} 1 & \frac{2}{z} & \frac{4}{z} & - \frac{1}{z} & \frac{3}{z} \\ 0 & 1 & 3 & 2 & 1 \\ 0 & 0 & - 3 - \frac{2}{z} & - 5 - \frac{5}{z} & \frac{1}{z} \end{array}]$

Step 5.5

Multiply each element of $R_{3}$ by $\frac{1}{- 3 - \frac{2}{z}}$ to make the entry at $3, 3$ a $1$ .

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Step 5.5.1

Multiply each element of $R_{3}$ by $\frac{1}{- 3 - \frac{2}{z}}$ to make the entry at $3, 3$ a $1$ .

$[\begin{array}{c} 1 & \frac{2}{z} & \frac{4}{z} & - \frac{1}{z} & \frac{3}{z} \\ 0 & 1 & 3 & 2 & 1 \\ \frac{0}{- 3 - \frac{2}{z}} & \frac{0}{- 3 - \frac{2}{z}} & \frac{- 3 - \frac{2}{z}}{- 3 - \frac{2}{z}} & \frac{- 5 - \frac{5}{z}}{- 3 - \frac{2}{z}} & \frac{\frac{1}{z}}{- 3 - \frac{2}{z}} \end{array}]$

Step 5.5.2

Simplify $R_{3}$ .

$[\begin{array}{c} 1 & \frac{2}{z} & \frac{4}{z} & - \frac{1}{z} & \frac{3}{z} \\ 0 & 1 & 3 & 2 & 1 \\ 0 & 0 & 1 & \frac{5 (z + 1)}{3 z + 2} & - \frac{1}{3 z + 2} \end{array}]$

Step 5.6

Perform the row operation $R_{2} = R_{2} - 3 R_{3}$ to make the entry at $2, 3$ a $0$ .

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Step 5.6.1

Perform the row operation $R_{2} = R_{2} - 3 R_{3}$ to make the entry at $2, 3$ a $0$ .

$[\begin{array}{c} 1 & \frac{2}{z} & \frac{4}{z} & - \frac{1}{z} & \frac{3}{z} \\ 0 - 3 \cdot 0 & 1 - 3 \cdot 0 & 3 - 3 \cdot 1 & 2 - 3 \frac{5 (z + 1)}{3 z + 2} & 1 - 3 (- \frac{1}{3 z + 2}) \\ 0 & 0 & 1 & \frac{5 (z + 1)}{3 z + 2} & - \frac{1}{3 z + 2} \end{array}]$

Step 5.6.2

Simplify $R_{2}$ .

$[\begin{array}{c} 1 & \frac{2}{z} & \frac{4}{z} & - \frac{1}{z} & \frac{3}{z} \\ 0 & 1 & 0 & - \frac{9 z + 11}{3 z + 2} & \frac{3 z + 5}{3 z + 2} \\ 0 & 0 & 1 & \frac{5 (z + 1)}{3 z + 2} & - \frac{1}{3 z + 2} \end{array}]$

Step 5.7

Perform the row operation $R_{1} = R_{1} - \frac{4}{z} R_{3}$ to make the entry at $1, 3$ a $0$ .

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Step 5.7.1

Perform the row operation $R_{1} = R_{1} - \frac{4}{z} R_{3}$ to make the entry at $1, 3$ a $0$ .

$[\begin{array}{c} 1 - \frac{4}{z} \cdot 0 & \frac{2}{z} - \frac{4}{z} \cdot 0 & \frac{4}{z} - \frac{4}{z} \cdot 1 & - \frac{1}{z} - \frac{4}{z} \cdot \frac{5 (z + 1)}{3 z + 2} & \frac{3}{z} - \frac{4}{z} (- \frac{1}{3 z + 2}) \\ 0 & 1 & 0 & - \frac{9 z + 11}{3 z + 2} & \frac{3 z + 5}{3 z + 2} \\ 0 & 0 & 1 & \frac{5 (z + 1)}{3 z + 2} & - \frac{1}{3 z + 2} \end{array}]$

Step 5.7.2

Simplify $R_{1}$ .

$[\begin{array}{c} 1 & \frac{2}{z} & 0 & - \frac{23 z + 22}{z (3 z + 2)} & \frac{3}{z} + \frac{4}{z (3 z + 2)} \\ 0 & 1 & 0 & - \frac{9 z + 11}{3 z + 2} & \frac{3 z + 5}{3 z + 2} \\ 0 & 0 & 1 & \frac{5 (z + 1)}{3 z + 2} & - \frac{1}{3 z + 2} \end{array}]$

Step 5.8

Perform the row operation $R_{1} = R_{1} - \frac{2}{z} R_{2}$ to make the entry at $1, 2$ a $0$ .

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Step 5.8.1

Perform the row operation $R_{1} = R_{1} - \frac{2}{z} R_{2}$ to make the entry at $1, 2$ a $0$ .

$[\begin{array}{c} 1 - \frac{2}{z} \cdot 0 & \frac{2}{z} - \frac{2}{z} \cdot 1 & 0 - \frac{2}{z} \cdot 0 & - \frac{23 z + 22}{z (3 z + 2)} - \frac{2}{z} (- \frac{9 z + 11}{3 z + 2}) & \frac{3}{z} + \frac{4}{z (3 z + 2)} - \frac{2}{z} \cdot \frac{3 z + 5}{3 z + 2} \\ 0 & 1 & 0 & - \frac{9 z + 11}{3 z + 2} & \frac{3 z + 5}{3 z + 2} \\ 0 & 0 & 1 & \frac{5 (z + 1)}{3 z + 2} & - \frac{1}{3 z + 2} \end{array}]$

Step 5.8.2

Simplify $R_{1}$ .

$[\begin{array}{c} 1 & 0 & 0 & - \frac{5}{3 z + 2} & \frac{3}{3 z + 2} \\ 0 & 1 & 0 & - \frac{9 z + 11}{3 z + 2} & \frac{3 z + 5}{3 z + 2} \\ 0 & 0 & 1 & \frac{5 (z + 1)}{3 z + 2} & - \frac{1}{3 z + 2} \end{array}]$

Step 6

Use the result matrix to declare the final solutions to the system of equations.

$k - \frac{5 z}{3 z + 2} = \frac{3}{3 z + 2}$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7

Solve the equation for $k$ .

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Step 7.1

Move all terms containing variables to the left side of the equation.

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Step 7.1.1

Subtract $\frac{3}{3 z + 2}$ from both sides of the equation.

$k - \frac{5 z}{3 z + 2} - \frac{3}{3 z + 2} = 0$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.1.2

To write $k$ as a fraction with a common denominator, multiply by $\frac{3 z + 2}{3 z + 2}$ .

$k \cdot \frac{3 z + 2}{3 z + 2} - \frac{5 z}{3 z + 2} - \frac{3}{3 z + 2} = 0$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.1.3

Combine $k$ and $\frac{3 z + 2}{3 z + 2}$ .

$\frac{k (3 z + 2)}{3 z + 2} - \frac{5 z}{3 z + 2} - \frac{3}{3 z + 2} = 0$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.1.4

Combine the numerators over the common denominator.

$\frac{k (3 z + 2) - 5 z}{3 z + 2} - \frac{3}{3 z + 2} = 0$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.1.5

Simplify the numerator.

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Step 7.1.5.1

Apply the distributive property.

$\frac{k (3 z) + k \cdot 2 - 5 z}{3 z + 2} - \frac{3}{3 z + 2} = 0$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.1.5.2

Rewrite using the commutative property of multiplication.

$\frac{3 k z + k \cdot 2 - 5 z}{3 z + 2} - \frac{3}{3 z + 2} = 0$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.1.5.3

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

$\frac{3 k z + 2 k - 5 z}{3 z + 2} - \frac{3}{3 z + 2} = 0$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

$\frac{3 k z + 2 k - 5 z}{3 z + 2} - \frac{3}{3 z + 2} = 0$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.1.6

Combine the numerators over the common denominator.

$\frac{3 k z + 2 k - 5 z - 3}{3 z + 2} = 0$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

$\frac{3 k z + 2 k - 5 z - 3}{3 z + 2} = 0$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.2

Set the numerator equal to zero.

$3 k z + 2 k - 5 z - 3 = 0$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.3

Solve the equation for $k$ .

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Step 7.3.1

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

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Step 7.3.1.1

Add $5 z$ to both sides of the equation.

$3 k z + 2 k - 3 = 5 z$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.3.1.2

Add $3$ to both sides of the equation.

$3 k z + 2 k = 5 z + 3$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

$3 k z + 2 k = 5 z + 3$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.3.2

Factor $k$ out of $3 k z + 2 k$ .

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Step 7.3.2.1

Factor $k$ out of $3 k z$ .

$k (3 z) + 2 k = 5 z + 3$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.3.2.2

Factor $k$ out of $2 k$ .

$k (3 z) + k \cdot 2 = 5 z + 3$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.3.2.3

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

$k (3 z + 2) = 5 z + 3$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

$k (3 z + 2) = 5 z + 3$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.3.3

Divide each term in $k (3 z + 2) = 5 z + 3$ by $3 z + 2$ and simplify.

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Step 7.3.3.1

Divide each term in $k (3 z + 2) = 5 z + 3$ by $3 z + 2$ .

$\frac{k (3 z + 2)}{3 z + 2} = \frac{5 z}{3 z + 2} + \frac{3}{3 z + 2}$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.3.3.2

Simplify the left side.

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Step 7.3.3.2.1

Cancel the common factor of $3 z + 2$ .

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Step 7.3.3.2.1.1

Cancel the common factor.

$\frac{k (3 z + 2)}{3 z + 2} = \frac{5 z}{3 z + 2} + \frac{3}{3 z + 2}$

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.3.3.2.1.2

Divide $k$ by $1$ .

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

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

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

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

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

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 7.3.3.3

Simplify the right side.

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Step 7.3.3.3.1

Combine the numerators over the common denominator.

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

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

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

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

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

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

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

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

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

$x - \frac{(9 z + 11) z}{3 z + 2} = \frac{3 z + 5}{3 z + 2}$

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

Step 8

Solve the equation for $x$ .

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Step 8.1

Move all terms containing variables to the left side of the equation.

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Step 8.1.1

Subtract $\frac{3 z + 5}{3 z + 2}$ from both sides of the equation.

$x - \frac{(9 z + 11) z}{3 z + 2} - \frac{3 z + 5}{3 z + 2} = 0$

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

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

Step 8.1.2

Combine the numerators over the common denominator.

$x + \frac{- (9 z + 11) z - (3 z + 5)}{3 z + 2} = 0$

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

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

Step 8.1.3

Simplify each term.

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Step 8.1.3.1

Apply the distributive property.

$x + \frac{(- (9 z) - 1 \cdot 11) z - (3 z + 5)}{3 z + 2} = 0$

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

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

Step 8.1.3.2

Multiply $9$ by $- 1$ .

$x + \frac{(- 9 z - 1 \cdot 11) z - (3 z + 5)}{3 z + 2} = 0$

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

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

Step 8.1.3.3

Multiply $- 1$ by $11$ .

$x + \frac{(- 9 z - 11) z - (3 z + 5)}{3 z + 2} = 0$

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

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

Step 8.1.3.4

Apply the distributive property.

$x + \frac{- 9 z \cdot z - 11 z - (3 z + 5)}{3 z + 2} = 0$

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

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

Step 8.1.3.5

Multiply $z$ by $z$ by adding the exponents.

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Step 8.1.3.5.1

Move $z$ .

$x + \frac{- 9 (z \cdot z) - 11 z - (3 z + 5)}{3 z + 2} = 0$

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

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

Step 8.1.3.5.2

Multiply $z$ by $z$ .

$x + \frac{- 9 z^{2} - 11 z - (3 z + 5)}{3 z + 2} = 0$

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

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

$x + \frac{- 9 z^{2} - 11 z - (3 z + 5)}{3 z + 2} = 0$

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

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

Step 8.1.3.6

Apply the distributive property.

$x + \frac{- 9 z^{2} - 11 z - (3 z) - 1 \cdot 5}{3 z + 2} = 0$

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

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

Step 8.1.3.7

Multiply $3$ by $- 1$ .

$x + \frac{- 9 z^{2} - 11 z - 3 z - 1 \cdot 5}{3 z + 2} = 0$

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

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

Step 8.1.3.8

Multiply $- 1$ by $5$ .

$x + \frac{- 9 z^{2} - 11 z - 3 z - 5}{3 z + 2} = 0$

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

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

$x + \frac{- 9 z^{2} - 11 z - 3 z - 5}{3 z + 2} = 0$

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

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

Step 8.1.4

Subtract $3 z$ from $- 11 z$ .

$x + \frac{- 9 z^{2} - 14 z - 5}{3 z + 2} = 0$

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

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

Step 8.1.5

Factor by grouping.

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Step 8.1.5.1

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = - 9 \cdot - 5 = 45$ and whose sum is $b = - 14$ .

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Step 8.1.5.1.1

Factor $- 14$ out of $- 14 z$ .

$x + \frac{- 9 z^{2} - 14 z - 5}{3 z + 2} = 0$

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

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

Step 8.1.5.1.2

Rewrite $- 14$ as $- 5$ plus $- 9$

$x + \frac{- 9 z^{2} + (- 5 - 9) z - 5}{3 z + 2} = 0$

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

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

Step 8.1.5.1.3

Apply the distributive property.

$x + \frac{- 9 z^{2} - 5 z - 9 z - 5}{3 z + 2} = 0$

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

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

$x + \frac{- 9 z^{2} - 5 z - 9 z - 5}{3 z + 2} = 0$

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

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

Step 8.1.5.2

Factor out the greatest common factor from each group.

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Step 8.1.5.2.1

Group the first two terms and the last two terms.

$x + \frac{(- 9 z^{2} - 5 z) - 9 z - 5}{3 z + 2} = 0$

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

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

Step 8.1.5.2.2

Factor out the greatest common factor (GCF) from each group.

$x + \frac{z (- 9 z - 5) + 1 (- 9 z - 5)}{3 z + 2} = 0$

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

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

$x + \frac{z (- 9 z - 5) + 1 (- 9 z - 5)}{3 z + 2} = 0$

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

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

Step 8.1.5.3

Factor the polynomial by factoring out the greatest common factor, $- 9 z - 5$ .

$x + \frac{(- 9 z - 5) (z + 1)}{3 z + 2} = 0$

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

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

$x + \frac{(- 9 z - 5) (z + 1)}{3 z + 2} = 0$

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

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

Step 8.1.6

To write $x$ as a fraction with a common denominator, multiply by $\frac{3 z + 2}{3 z + 2}$ .

$x \cdot \frac{3 z + 2}{3 z + 2} + \frac{(- 9 z - 5) (z + 1)}{3 z + 2} = 0$

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

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

Step 8.1.7

Combine $x$ and $\frac{3 z + 2}{3 z + 2}$ .

$\frac{x (3 z + 2)}{3 z + 2} + \frac{(- 9 z - 5) (z + 1)}{3 z + 2} = 0$

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

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

Step 8.1.8

Combine the numerators over the common denominator.

$\frac{x (3 z + 2) + (- 9 z - 5) (z + 1)}{3 z + 2} = 0$

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

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

Step 8.1.9

Simplify the numerator.

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Step 8.1.9.1

Apply the distributive property.

$\frac{x (3 z) + x \cdot 2 + (- 9 z - 5) (z + 1)}{3 z + 2} = 0$

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

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

Step 8.1.9.2

Rewrite using the commutative property of multiplication.

$\frac{3 x z + x \cdot 2 + (- 9 z - 5) (z + 1)}{3 z + 2} = 0$

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

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

Step 8.1.9.3

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

$\frac{3 x z + 2 \cdot x + (- 9 z - 5) (z + 1)}{3 z + 2} = 0$

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

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

Step 8.1.9.4

Expand $(- 9 z - 5) (z + 1)$ using the FOIL Method.

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Step 8.1.9.4.1

Apply the distributive property.

$\frac{3 x z + 2 x - 9 z (z + 1) - 5 (z + 1)}{3 z + 2} = 0$

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

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

Step 8.1.9.4.2

Apply the distributive property.

$\frac{3 x z + 2 x - 9 z \cdot z - 9 z \cdot 1 - 5 (z + 1)}{3 z + 2} = 0$

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

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

Step 8.1.9.4.3

Apply the distributive property.

$\frac{3 x z + 2 x - 9 z \cdot z - 9 z \cdot 1 - 5 z - 5 \cdot 1}{3 z + 2} = 0$

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

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

$\frac{3 x z + 2 x - 9 z \cdot z - 9 z \cdot 1 - 5 z - 5 \cdot 1}{3 z + 2} = 0$

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

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

Step 8.1.9.5

Simplify and combine like terms.

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Step 8.1.9.5.1

Simplify each term.

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Step 8.1.9.5.1.1

Multiply $z$ by $z$ by adding the exponents.

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Step 8.1.9.5.1.1.1

Move $z$ .

$\frac{3 x z + 2 x - 9 (z \cdot z) - 9 z \cdot 1 - 5 z - 5 \cdot 1}{3 z + 2} = 0$

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

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

Step 8.1.9.5.1.1.2

Multiply $z$ by $z$ .

$\frac{3 x z + 2 x - 9 z^{2} - 9 z \cdot 1 - 5 z - 5 \cdot 1}{3 z + 2} = 0$

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

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

$\frac{3 x z + 2 x - 9 z^{2} - 9 z \cdot 1 - 5 z - 5 \cdot 1}{3 z + 2} = 0$

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

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

Step 8.1.9.5.1.2

Multiply $- 9$ by $1$ .

$\frac{3 x z + 2 x - 9 z^{2} - 9 z - 5 z - 5 \cdot 1}{3 z + 2} = 0$

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

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

Step 8.1.9.5.1.3

Multiply $- 5$ by $1$ .

$\frac{3 x z + 2 x - 9 z^{2} - 9 z - 5 z - 5}{3 z + 2} = 0$

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

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

$\frac{3 x z + 2 x - 9 z^{2} - 9 z - 5 z - 5}{3 z + 2} = 0$

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

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

Step 8.1.9.5.2

Subtract $5 z$ from $- 9 z$ .

$\frac{3 x z + 2 x - 9 z^{2} - 14 z - 5}{3 z + 2} = 0$

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

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

$\frac{3 x z + 2 x - 9 z^{2} - 14 z - 5}{3 z + 2} = 0$

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

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

$\frac{3 x z + 2 x - 9 z^{2} - 14 z - 5}{3 z + 2} = 0$

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

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

$\frac{3 x z + 2 x - 9 z^{2} - 14 z - 5}{3 z + 2} = 0$

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

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

Step 8.2

Set the numerator equal to zero.

$3 x z + 2 x - 9 z^{2} - 14 z - 5 = 0$

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

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

Step 8.3

Solve the equation for $x$ .

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Step 8.3.1

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

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Step 8.3.1.1

Add $9 z^{2}$ to both sides of the equation.

$3 x z + 2 x - 14 z - 5 = 9 z^{2}$

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

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

Step 8.3.1.2

Add $14 z$ to both sides of the equation.

$3 x z + 2 x - 5 = 9 z^{2} + 14 z$

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

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

Step 8.3.1.3

Add $5$ to both sides of the equation.

$3 x z + 2 x = 9 z^{2} + 14 z + 5$

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

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

$3 x z + 2 x = 9 z^{2} + 14 z + 5$

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

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

Step 8.3.2

Factor $x$ out of $3 x z + 2 x$ .

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Step 8.3.2.1

Factor $x$ out of $3 x z$ .

$x (3 z) + 2 x = 9 z^{2} + 14 z + 5$

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

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

Step 8.3.2.2

Factor $x$ out of $2 x$ .

$x (3 z) + x \cdot 2 = 9 z^{2} + 14 z + 5$

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

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

Step 8.3.2.3

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

$x (3 z + 2) = 9 z^{2} + 14 z + 5$

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

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

$x (3 z + 2) = 9 z^{2} + 14 z + 5$

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

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

Step 8.3.3

Divide each term in $x (3 z + 2) = 9 z^{2} + 14 z + 5$ by $3 z + 2$ and simplify.

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Step 8.3.3.1

Divide each term in $x (3 z + 2) = 9 z^{2} + 14 z + 5$ by $3 z + 2$ .

$\frac{x (3 z + 2)}{3 z + 2} = \frac{9 z^{2}}{3 z + 2} + \frac{14 z}{3 z + 2} + \frac{5}{3 z + 2}$

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

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

Step 8.3.3.2

Simplify the left side.

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Step 8.3.3.2.1

Cancel the common factor of $3 z + 2$ .

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Step 8.3.3.2.1.1

Cancel the common factor.

$\frac{x (3 z + 2)}{3 z + 2} = \frac{9 z^{2}}{3 z + 2} + \frac{14 z}{3 z + 2} + \frac{5}{3 z + 2}$

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

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

Step 8.3.3.2.1.2

Divide $x$ by $1$ .

$x = \frac{9 z^{2}}{3 z + 2} + \frac{14 z}{3 z + 2} + \frac{5}{3 z + 2}$

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

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

$x = \frac{9 z^{2}}{3 z + 2} + \frac{14 z}{3 z + 2} + \frac{5}{3 z + 2}$

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

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

$x = \frac{9 z^{2}}{3 z + 2} + \frac{14 z}{3 z + 2} + \frac{5}{3 z + 2}$

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

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

Step 8.3.3.3

Simplify the right side.

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Step 8.3.3.3.1

Combine the numerators over the common denominator.

$x = \frac{9 z^{2} + 14 z + 5}{3 z + 2}$

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

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

Step 8.3.3.3.2

Factor by grouping.

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Step 8.3.3.3.2.1

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = 9 \cdot 5 = 45$ and whose sum is $b = 14$ .

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Step 8.3.3.3.2.1.1

Factor $14$ out of $14 z$ .

$x = \frac{9 z^{2} + 14 (z) + 5}{3 z + 2}$

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

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

Step 8.3.3.3.2.1.2

Rewrite $14$ as $5$ plus $9$

$x = \frac{9 z^{2} + (5 + 9) z + 5}{3 z + 2}$

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

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

Step 8.3.3.3.2.1.3

Apply the distributive property.

$x = \frac{9 z^{2} + 5 z + 9 z + 5}{3 z + 2}$

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

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

$x = \frac{9 z^{2} + 5 z + 9 z + 5}{3 z + 2}$

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

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

Step 8.3.3.3.2.2

Factor out the greatest common factor from each group.

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Step 8.3.3.3.2.2.1

Group the first two terms and the last two terms.

$x = \frac{(9 z^{2} + 5 z) + 9 z + 5}{3 z + 2}$

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

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

Step 8.3.3.3.2.2.2

Factor out the greatest common factor (GCF) from each group.

$x = \frac{z (9 z + 5) + 1 (9 z + 5)}{3 z + 2}$

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

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

$x = \frac{z (9 z + 5) + 1 (9 z + 5)}{3 z + 2}$

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

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

Step 8.3.3.3.2.3

Factor the polynomial by factoring out the greatest common factor, $9 z + 5$ .

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

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

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

Step 9

Solve the equation for $y$ .

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Step 9.1

Move all terms containing variables to the left side of the equation.

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Step 9.1.1

Add $\frac{1}{3 z + 2}$ to both sides of the equation.

$y + \frac{5 (z + 1) z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.2

To write $y$ as a fraction with a common denominator, multiply by $\frac{3 z + 2}{3 z + 2}$ .

$y \cdot \frac{3 z + 2}{3 z + 2} + \frac{5 (z + 1) z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.3

Combine $y$ and $\frac{3 z + 2}{3 z + 2}$ .

$\frac{y (3 z + 2)}{3 z + 2} + \frac{5 (z + 1) z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.4

Combine the numerators over the common denominator.

$\frac{y (3 z + 2) + 5 (z + 1) z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.5

Simplify the numerator.

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Step 9.1.5.1

Apply the distributive property.

$\frac{y (3 z) + y \cdot 2 + 5 (z + 1) z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.5.2

Rewrite using the commutative property of multiplication.

$\frac{3 y z + y \cdot 2 + 5 (z + 1) z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.5.3

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

$\frac{3 y z + 2 \cdot y + 5 (z + 1) z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.5.4

Apply the distributive property.

$\frac{3 y z + 2 y + (5 z + 5 \cdot 1) z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.5.5

Multiply $5$ by $1$ .

$\frac{3 y z + 2 y + (5 z + 5) z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.5.6

Apply the distributive property.

$\frac{3 y z + 2 y + 5 z \cdot z + 5 z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.5.7

Multiply $z$ by $z$ by adding the exponents.

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Step 9.1.5.7.1

Move $z$ .

$\frac{3 y z + 2 y + 5 (z \cdot z) + 5 z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.5.7.2

Multiply $z$ by $z$ .

$\frac{3 y z + 2 y + 5 z^{2} + 5 z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$\frac{3 y z + 2 y + 5 z^{2} + 5 z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$\frac{3 y z + 2 y + 5 z^{2} + 5 z}{3 z + 2} + \frac{1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.1.6

Combine the numerators over the common denominator.

$\frac{3 y z + 2 y + 5 z^{2} + 5 z + 1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$\frac{3 y z + 2 y + 5 z^{2} + 5 z + 1}{3 z + 2} = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.2

Set the numerator equal to zero.

$3 y z + 2 y + 5 z^{2} + 5 z + 1 = 0$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3

Solve the equation for $y$ .

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Step 9.3.1

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

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Step 9.3.1.1

Subtract $5 z^{2}$ from both sides of the equation.

$3 y z + 2 y + 5 z + 1 = - 5 z^{2}$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.1.2

Subtract $5 z$ from both sides of the equation.

$3 y z + 2 y + 1 = - 5 z^{2} - 5 z$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.1.3

Subtract $1$ from both sides of the equation.

$3 y z + 2 y = - 5 z^{2} - 5 z - 1$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$3 y z + 2 y = - 5 z^{2} - 5 z - 1$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.2

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

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Step 9.3.2.1

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

$y (3 z) + 2 y = - 5 z^{2} - 5 z - 1$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.2.2

Factor $y$ out of $2 y$ .

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.2.3

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

$y (3 z + 2) = - 5 z^{2} - 5 z - 1$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$y (3 z + 2) = - 5 z^{2} - 5 z - 1$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.3

Divide each term in $y (3 z + 2) = - 5 z^{2} - 5 z - 1$ by $3 z + 2$ and simplify.

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Step 9.3.3.1

Divide each term in $y (3 z + 2) = - 5 z^{2} - 5 z - 1$ by $3 z + 2$ .

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.3.2

Simplify the left side.

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Step 9.3.3.2.1

Cancel the common factor of $3 z + 2$ .

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Step 9.3.3.2.1.1

Cancel the common factor.

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{- 5 z^{2}}{3 z + 2} + \frac{- 5 z}{3 z + 2} + \frac{- 1}{3 z + 2}$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$y = \frac{- 5 z^{2}}{3 z + 2} + \frac{- 5 z}{3 z + 2} + \frac{- 1}{3 z + 2}$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$y = \frac{- 5 z^{2}}{3 z + 2} + \frac{- 5 z}{3 z + 2} + \frac{- 1}{3 z + 2}$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.3.3

Simplify the right side.

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Step 9.3.3.3.1

Combine the numerators over the common denominator.

$y = \frac{- 5 z^{2} - 5 z - 1}{3 z + 2}$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.3.3.2

Factor $- 1$ out of $- 5 z^{2}$ .

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.3.3.3

Factor $- 1$ out of $- 5 z$ .

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.3.3.4

Factor $- 1$ out of $- (5 z^{2}) - (5 z)$ .

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.3.3.5

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

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.3.3.6

Factor $- 1$ out of $- (5 z^{2} + 5 z) - 1 (1)$ .

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.3.3.7

Simplify the expression.

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Step 9.3.3.3.7.1

Rewrite $- (5 z^{2} + 5 z + 1)$ as $- 1 (5 z^{2} + 5 z + 1)$ .

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

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 9.3.3.3.7.2

Move the negative in front of the fraction.

$y = - \frac{5 z^{2} + 5 z + 1}{3 z + 2}$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$y = - \frac{5 z^{2} + 5 z + 1}{3 z + 2}$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$y = - \frac{5 z^{2} + 5 z + 1}{3 z + 2}$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$y = - \frac{5 z^{2} + 5 z + 1}{3 z + 2}$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$y = - \frac{5 z^{2} + 5 z + 1}{3 z + 2}$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

$y = - \frac{5 z^{2} + 5 z + 1}{3 z + 2}$

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

$x = \frac{(9 z + 5) (z + 1)}{3 z + 2}$

Step 10

The solution is the set of ordered pairs that makes the system true.

$(\frac{5 z + 3}{3 z + 2}, \frac{(9 z + 5) (z + 1)}{3 z + 2}, - \frac{5 z^{2} + 5 z + 1}{3 z + 2}, z)$

Step 11

Decompose a solution vector by re-arranging each equation represented in the row-reduced form of the augmented matrix by solving for the dependent variable in each row yields the vector equality.

$X = [\begin{array}{c} k \\ x \\ y \\ z \end{array}] = [\begin{array}{c} \frac{5 z + 3}{3 z + 2} \\ \frac{(9 z + 5) (z + 1)}{3 z + 2} \\ - \frac{5 z^{2} + 5 z + 1}{3 z + 2} \\ z \end{array}]$