Algebra Examples

$x - 3 y + z = 4$ $3 x - 6 y + 9 z = 5$ $4 x - 9 y + 10 z = 9$

Step 1

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

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Step 1.1

Add $3 y$ to both sides of the equation.

$x + z = 4 + 3 y$

$3 x - 6 y + 9 z = 5$

$4 x - 9 y + 10 z = 9$

Step 1.2

Subtract $z$ from both sides of the equation.

$x = 4 + 3 y - z$

$3 x - 6 y + 9 z = 5$

$4 x - 9 y + 10 z = 9$

$x = 4 + 3 y - z$

$3 x - 6 y + 9 z = 5$

$4 x - 9 y + 10 z = 9$

Step 2

Replace all occurrences of $x$ with $4 + 3 y - z$ in each equation.

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Step 2.1

Replace all occurrences of $x$ in $3 x - 6 y + 9 z = 5$ with $4 + 3 y - z$ .

$3 (4 + 3 y - z) - 6 y + 9 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify $3 (4 + 3 y - z) - 6 y + 9 z$ .

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Step 2.2.1.1

Simplify each term.

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Step 2.2.1.1.1

Apply the distributive property.

$3 \cdot 4 + 3 (3 y) + 3 (- z) - 6 y + 9 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

Step 2.2.1.1.2

Simplify.

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Step 2.2.1.1.2.1

Multiply $3$ by $4$ .

$12 + 3 (3 y) + 3 (- z) - 6 y + 9 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

Step 2.2.1.1.2.2

Multiply $3$ by $3$ .

$12 + 9 y + 3 (- z) - 6 y + 9 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

Step 2.2.1.1.2.3

Multiply $- 1$ by $3$ .

$12 + 9 y - 3 z - 6 y + 9 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

$12 + 9 y - 3 z - 6 y + 9 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

$12 + 9 y - 3 z - 6 y + 9 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

Step 2.2.1.2

Simplify by adding terms.

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Step 2.2.1.2.1

Subtract $6 y$ from $9 y$ .

$12 + 3 y - 3 z + 9 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

Step 2.2.1.2.2

Add $- 3 z$ and $9 z$ .

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$4 x - 9 y + 10 z = 9$

Step 2.3

Replace all occurrences of $x$ in $4 x - 9 y + 10 z = 9$ with $4 + 3 y - z$ .

$4 (4 + 3 y - z) - 9 y + 10 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 2.4

Simplify the left side.

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Step 2.4.1

Simplify $4 (4 + 3 y - z) - 9 y + 10 z$ .

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Step 2.4.1.1

Simplify each term.

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Step 2.4.1.1.1

Apply the distributive property.

$4 \cdot 4 + 4 (3 y) + 4 (- z) - 9 y + 10 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 2.4.1.1.2

Simplify.

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Step 2.4.1.1.2.1

Multiply $4$ by $4$ .

$16 + 4 (3 y) + 4 (- z) - 9 y + 10 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 2.4.1.1.2.2

Multiply $3$ by $4$ .

$16 + 12 y + 4 (- z) - 9 y + 10 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 2.4.1.1.2.3

Multiply $- 1$ by $4$ .

$16 + 12 y - 4 z - 9 y + 10 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$16 + 12 y - 4 z - 9 y + 10 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$16 + 12 y - 4 z - 9 y + 10 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 2.4.1.2

Simplify by adding terms.

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Step 2.4.1.2.1

Subtract $9 y$ from $12 y$ .

$16 + 3 y - 4 z + 10 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 2.4.1.2.2

Add $- 4 z$ and $10 z$ .

$16 + 3 y + 6 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$16 + 3 y + 6 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$16 + 3 y + 6 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$16 + 3 y + 6 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$16 + 3 y + 6 z = 9$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3

Solve for $y$ in $16 + 3 y + 6 z = 9$ .

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Step 3.1

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

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Step 3.1.1

Subtract $16$ from both sides of the equation.

$3 y + 6 z = 9 - 16$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3.1.2

Subtract $6 z$ from both sides of the equation.

$3 y = 9 - 16 - 6 z$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3.1.3

Subtract $16$ from $9$ .

$3 y = - 7 - 6 z$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$3 y = - 7 - 6 z$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3.2

Divide each term in $3 y = - 7 - 6 z$ by $3$ and simplify.

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Step 3.2.1

Divide each term in $3 y = - 7 - 6 z$ by $3$ .

$\frac{3 y}{3} = \frac{- 7}{3} + \frac{- 6 z}{3}$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Cancel the common factor of $3$ .

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Step 3.2.2.1.1

Cancel the common factor.

$\frac{3 y}{3} = \frac{- 7}{3} + \frac{- 6 z}{3}$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{- 7}{3} + \frac{- 6 z}{3}$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$y = \frac{- 7}{3} + \frac{- 6 z}{3}$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

$y = \frac{- 7}{3} + \frac{- 6 z}{3}$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3.2.3

Simplify the right side.

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Step 3.2.3.1

Simplify each term.

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Step 3.2.3.1.1

Move the negative in front of the fraction.

$y = - \frac{7}{3} + \frac{- 6 z}{3}$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3.2.3.1.2

Cancel the common factor of $- 6$ and $3$ .

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Step 3.2.3.1.2.1

Factor $3$ out of $- 6 z$ .

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

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3.2.3.1.2.2

Cancel the common factors.

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Step 3.2.3.1.2.2.1

Factor $3$ out of $3$ .

$y = - \frac{7}{3} + \frac{3 (- 2 z)}{3 (1)}$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3.2.3.1.2.2.2

Cancel the common factor.

$y = - \frac{7}{3} + \frac{3 (- 2 z)}{3 \cdot 1}$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3.2.3.1.2.2.3

Rewrite the expression.

$y = - \frac{7}{3} + \frac{- 2 z}{1}$

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 3.2.3.1.2.2.4

Divide $- 2 z$ by $1$ .

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

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

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

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

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

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

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

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

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

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

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

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

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

$12 + 3 y + 6 z = 5$

$x = 4 + 3 y - z$

Step 4

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

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Step 4.1

Replace all occurrences of $y$ in $12 + 3 y + 6 z = 5$ with $- \frac{7}{3} - 2 z$ .

$12 + 3 (- \frac{7}{3} - 2 z) + 6 z = 5$

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

$x = 4 + 3 y - z$

Step 4.2

Simplify the left side.

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Step 4.2.1

Simplify $12 + 3 (- \frac{7}{3} - 2 z) + 6 z$ .

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Step 4.2.1.1

Simplify each term.

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Step 4.2.1.1.1

Apply the distributive property.

$12 + 3 (- \frac{7}{3}) + 3 (- 2 z) + 6 z = 5$

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

$x = 4 + 3 y - z$

Step 4.2.1.1.2

Cancel the common factor of $3$ .

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Step 4.2.1.1.2.1

Move the leading negative in $- \frac{7}{3}$ into the numerator.

$12 + 3 (\frac{- 7}{3}) + 3 (- 2 z) + 6 z = 5$

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

$x = 4 + 3 y - z$

Step 4.2.1.1.2.2

Cancel the common factor.

$12 + 3 (\frac{- 7}{3}) + 3 (- 2 z) + 6 z = 5$

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

$x = 4 + 3 y - z$

Step 4.2.1.1.2.3

Rewrite the expression.

$12 - 7 + 3 (- 2 z) + 6 z = 5$

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

$x = 4 + 3 y - z$

$12 - 7 + 3 (- 2 z) + 6 z = 5$

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

$x = 4 + 3 y - z$

Step 4.2.1.1.3

Multiply $- 2$ by $3$ .

$12 - 7 - 6 z + 6 z = 5$

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

$x = 4 + 3 y - z$

$12 - 7 - 6 z + 6 z = 5$

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

$x = 4 + 3 y - z$

Step 4.2.1.2

Simplify by adding terms.

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Step 4.2.1.2.1

Combine the opposite terms in $12 - 7 - 6 z + 6 z$ .

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Step 4.2.1.2.1.1

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

$12 - 7 + 0 = 5$

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

$x = 4 + 3 y - z$

Step 4.2.1.2.1.2

Add $12 - 7$ and $0$ .

$12 - 7 = 5$

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

$x = 4 + 3 y - z$

$12 - 7 = 5$

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

$x = 4 + 3 y - z$

Step 4.2.1.2.2

Subtract $7$ from $12$ .

$5 = 5$

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

$x = 4 + 3 y - z$

$5 = 5$

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

$x = 4 + 3 y - z$

$5 = 5$

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

$x = 4 + 3 y - z$

$5 = 5$

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

$x = 4 + 3 y - z$

Step 4.3

Replace all occurrences of $y$ in $x = 4 + 3 y - z$ with $- \frac{7}{3} - 2 z$ .

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

$5 = 5$

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

Step 4.4

Simplify the right side.

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Step 4.4.1

Simplify $4 + 3 (- \frac{7}{3} - 2 z) - z$ .

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Step 4.4.1.1

Simplify each term.

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Step 4.4.1.1.1

Apply the distributive property.

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

$5 = 5$

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

Step 4.4.1.1.2

Cancel the common factor of $3$ .

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Step 4.4.1.1.2.1

Move the leading negative in $- \frac{7}{3}$ into the numerator.

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

$5 = 5$

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

Step 4.4.1.1.2.2

Cancel the common factor.

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

$5 = 5$

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

Step 4.4.1.1.2.3

Rewrite the expression.

$x = 4 - 7 + 3 (- 2 z) - z$

$5 = 5$

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

$x = 4 - 7 + 3 (- 2 z) - z$

$5 = 5$

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

Step 4.4.1.1.3

Multiply $- 2$ by $3$ .

$x = 4 - 7 - 6 z - z$

$5 = 5$

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

$x = 4 - 7 - 6 z - z$

$5 = 5$

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

Step 4.4.1.2

Simplify by adding terms.

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Step 4.4.1.2.1

Subtract $7$ from $4$ .

$x = - 3 - 6 z - z$

$5 = 5$

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

Step 4.4.1.2.2

Subtract $z$ from $- 6 z$ .

$x = - 3 - 7 z$

$5 = 5$

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

$x = - 3 - 7 z$

$5 = 5$

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

$x = - 3 - 7 z$

$5 = 5$

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

$x = - 3 - 7 z$

$5 = 5$

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

$x = - 3 - 7 z$

$5 = 5$

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

Step 5

Remove any equations from the system that are always true.

$x = - 3 - 7 z$

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