Algebra Examples

x + y - z = 3

$x + y - z = 3$ ,

2 x - 8 y + 13 z = 1

$2 x - 8 y + 13 z = 1$

Step 1

Move all terms not containing

x

$x$ to the right side of the equation.

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Step 1.1

Subtract

y

$y$ from both sides of the equation.

x - z = 3 - y

$x - z = 3 - y$

2 x - 8 y + 13 z = 1

$2 x - 8 y + 13 z = 1$

Step 1.2

Add

z

$z$ to both sides of the equation.

x = 3 - y + z

$x = 3 - y + z$

2 x - 8 y + 13 z = 1

$2 x - 8 y + 13 z = 1$

x = 3 - y + z

$x = 3 - y + z$

2 x - 8 y + 13 z = 1

$2 x - 8 y + 13 z = 1$

Step 2

Solve the equation for

y

$y$ .

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Step 2.1

Simplify

2 (3 - y + z) - 8 y + 13 z

$2 (3 - y + z) - 8 y + 13 z$ .

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Step 2.1.1

Simplify each term.

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Step 2.1.1.1

Apply the distributive property.

2 \cdot 3 + 2 (- y) + 2 z - 8 y + 13 z = 1

$2 \cdot 3 + 2 (- y) + 2 z - 8 y + 13 z = 1$

x = 3 - y + z

$x = 3 - y + z$

Step 2.1.1.2

Simplify.

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Step 2.1.1.2.1

Multiply

2

$2$ by

3

$3$ .

6 + 2 (- y) + 2 z - 8 y + 13 z = 1

$6 + 2 (- y) + 2 z - 8 y + 13 z = 1$

x = 3 - y + z

$x = 3 - y + z$

Step 2.1.1.2.2

Multiply

- 1

$- 1$ by

2

$2$ .

6 - 2 y + 2 z - 8 y + 13 z = 1

$6 - 2 y + 2 z - 8 y + 13 z = 1$

x = 3 - y + z

$x = 3 - y + z$

6 - 2 y + 2 z - 8 y + 13 z = 1

$6 - 2 y + 2 z - 8 y + 13 z = 1$

x = 3 - y + z

$x = 3 - y + z$

6 - 2 y + 2 z - 8 y + 13 z = 1

$6 - 2 y + 2 z - 8 y + 13 z = 1$

x = 3 - y + z

$x = 3 - y + z$

Step 2.1.2

Simplify by adding terms.

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Step 2.1.2.1

Subtract

8 y

$8 y$ from

- 2 y

$- 2 y$ .

6 - 10 y + 2 z + 13 z = 1

$6 - 10 y + 2 z + 13 z = 1$

x = 3 - y + z

$x = 3 - y + z$

Step 2.1.2.2

Add

2 z

$2 z$ and

13 z

$13 z$ .

6 - 10 y + 15 z = 1

$6 - 10 y + 15 z = 1$

x = 3 - y + z

$x = 3 - y + z$

6 - 10 y + 15 z = 1

$6 - 10 y + 15 z = 1$

x = 3 - y + z

$x = 3 - y + z$

6 - 10 y + 15 z = 1

$6 - 10 y + 15 z = 1$

x = 3 - y + z

$x = 3 - y + z$

Step 2.2

Move all terms not containing

y

$y$ to the right side of the equation.

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Step 2.2.1

Subtract

6

$6$ from both sides of the equation.

- 10 y + 15 z = 1 - 6

$- 10 y + 15 z = 1 - 6$

x = 3 - y + z

$x = 3 - y + z$

Step 2.2.2

Subtract

15 z

$15 z$ from both sides of the equation.

- 10 y = 1 - 6 - 15 z

$- 10 y = 1 - 6 - 15 z$

x = 3 - y + z

$x = 3 - y + z$

Step 2.2.3

Subtract

6

$6$ from

1

$1$ .

- 10 y = - 5 - 15 z

$- 10 y = - 5 - 15 z$

x = 3 - y + z

$x = 3 - y + z$

- 10 y = - 5 - 15 z

$- 10 y = - 5 - 15 z$

x = 3 - y + z

$x = 3 - y + z$

Step 2.3

Divide each term in

- 10 y = - 5 - 15 z

$- 10 y = - 5 - 15 z$ by

- 10

$- 10$ and simplify.

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Step 2.3.1

Divide each term in

- 10 y = - 5 - 15 z

$- 10 y = - 5 - 15 z$ by

- 10

$- 10$ .

\frac{- 10 y}{- 10} = \frac{- 5}{- 10} + \frac{- 15 z}{- 10}

$\frac{- 10 y}{- 10} = \frac{- 5}{- 10} + \frac{- 15 z}{- 10}$

x = 3 - y + z

$x = 3 - y + z$

Step 2.3.2

Simplify the left side.

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Step 2.3.2.1

Cancel the common factor of

- 10

$- 10$ .

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Step 2.3.2.1.1

Cancel the common factor.

\frac{- 10 y}{- 10} = \frac{- 5}{- 10} + \frac{- 15 z}{- 10}

$\frac{- 10 y}{- 10} = \frac{- 5}{- 10} + \frac{- 15 z}{- 10}$

x = 3 - y + z

$x = 3 - y + z$

Step 2.3.2.1.2

Divide

y

$y$ by

1

$1$ .

y = \frac{- 5}{- 10} + \frac{- 15 z}{- 10}

$y = \frac{- 5}{- 10} + \frac{- 15 z}{- 10}$

x = 3 - y + z

$x = 3 - y + z$

y = \frac{- 5}{- 10} + \frac{- 15 z}{- 10}

$y = \frac{- 5}{- 10} + \frac{- 15 z}{- 10}$

x = 3 - y + z

$x = 3 - y + z$

y = \frac{- 5}{- 10} + \frac{- 15 z}{- 10}

$y = \frac{- 5}{- 10} + \frac{- 15 z}{- 10}$

x = 3 - y + z

$x = 3 - y + z$

Step 2.3.3

Simplify the right side.

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Step 2.3.3.1

Simplify each term.

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Step 2.3.3.1.1

Cancel the common factor of

- 5

$- 5$ and

- 10

$- 10$ .

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Step 2.3.3.1.1.1

Factor

- 5

$- 5$ out of

- 5

$- 5$ .

y = \frac{- 5 \cdot 1}{- 10} + \frac{- 15 z}{- 10}

$y = \frac{- 5 \cdot 1}{- 10} + \frac{- 15 z}{- 10}$

x = 3 - y + z

$x = 3 - y + z$

Step 2.3.3.1.1.2

Cancel the common factors.

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Step 2.3.3.1.1.2.1

Factor

- 5

$- 5$ out of

- 10

$- 10$ .

y = \frac{- 5 \cdot 1}{- 5 \cdot 2} + \frac{- 15 z}{- 10}

$y = \frac{- 5 \cdot 1}{- 5 \cdot 2} + \frac{- 15 z}{- 10}$

x = 3 - y + z

$x = 3 - y + z$

Step 2.3.3.1.1.2.2

Cancel the common factor.

y = \frac{- 5 \cdot 1}{- 5 \cdot 2} + \frac{- 15 z}{- 10}

$y = \frac{- 5 \cdot 1}{- 5 \cdot 2} + \frac{- 15 z}{- 10}$

x = 3 - y + z

$x = 3 - y + z$

Step 2.3.3.1.1.2.3

Rewrite the expression.

y = \frac{1}{2} + \frac{- 15 z}{- 10}

$y = \frac{1}{2} + \frac{- 15 z}{- 10}$

x = 3 - y + z

$x = 3 - y + z$

y = \frac{1}{2} + \frac{- 15 z}{- 10}

$y = \frac{1}{2} + \frac{- 15 z}{- 10}$

x = 3 - y + z

$x = 3 - y + z$

y = \frac{1}{2} + \frac{- 15 z}{- 10}

$y = \frac{1}{2} + \frac{- 15 z}{- 10}$

x = 3 - y + z

$x = 3 - y + z$

Step 2.3.3.1.2

Cancel the common factor of

- 15

$- 15$ and

- 10

$- 10$ .

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Step 2.3.3.1.2.1

Factor

- 5

$- 5$ out of

- 15 z

$- 15 z$ .

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

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

x = 3 - y + z

$x = 3 - y + z$

Step 2.3.3.1.2.2

Cancel the common factors.

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Step 2.3.3.1.2.2.1

Factor

- 5

$- 5$ out of

- 10

$- 10$ .

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

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

x = 3 - y + z

$x = 3 - y + z$

Step 2.3.3.1.2.2.2

Cancel the common factor.

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

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

x = 3 - y + z

$x = 3 - y + z$

Step 2.3.3.1.2.2.3

Rewrite the expression.

y = \frac{1}{2} + \frac{3 z}{2}

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

x = 3 - y + z

$x = 3 - y + z$

y = \frac{1}{2} + \frac{3 z}{2}

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

x = 3 - y + z

$x = 3 - y + z$

y = \frac{1}{2} + \frac{3 z}{2}

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

x = 3 - y + z

$x = 3 - y + z$

y = \frac{1}{2} + \frac{3 z}{2}

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

x = 3 - y + z

$x = 3 - y + z$

y = \frac{1}{2} + \frac{3 z}{2}

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

x = 3 - y + z

$x = 3 - y + z$

y = \frac{1}{2} + \frac{3 z}{2}

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

x = 3 - y + z

$x = 3 - y + z$

y = \frac{1}{2} + \frac{3 z}{2}

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

x = 3 - y + z

$x = 3 - y + z$

Step 3

Simplify the right side.

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Step 3.1

Simplify

3 - (\frac{1}{2} + \frac{3 z}{2}) + z

$3 - (\frac{1}{2} + \frac{3 z}{2}) + z$ .

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Step 3.1.1

Apply the distributive property.

x = 3 - \frac{1}{2} - \frac{3 z}{2} + z

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

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 3.1.2

To write

3

$3$ as a fraction with a common denominator, multiply by

\frac{2}{2}

$\frac{2}{2}$ .

x = 3 \cdot \frac{2}{2} - \frac{1}{2} - \frac{3 z}{2} + z

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

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 3.1.3

Combine

3

$3$ and

\frac{2}{2}

$\frac{2}{2}$ .

x = \frac{3 \cdot 2}{2} - \frac{1}{2} - \frac{3 z}{2} + z

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

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 3.1.4

Combine the numerators over the common denominator.

x = \frac{3 \cdot 2 - 1}{2} - \frac{3 z}{2} + z

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

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 3.1.5

Simplify the numerator.

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Step 3.1.5.1

Multiply

3

$3$ by

2

$2$ .

x = \frac{6 - 1}{2} - \frac{3 z}{2} + z

$x = \frac{6 - 1}{2} - \frac{3 z}{2} + z$

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 3.1.5.2

Subtract

1

$1$ from

6

$6$ .

x = \frac{5}{2} - \frac{3 z}{2} + z

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

y = \frac{1}{2} + \frac{3 z}{2}

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

x = \frac{5}{2} - \frac{3 z}{2} + z

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

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 3.1.6

To write

z

$z$ as a fraction with a common denominator, multiply by

\frac{2}{2}

$\frac{2}{2}$ .

x = \frac{5}{2} - \frac{3 z}{2} + z \cdot \frac{2}{2}

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

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 3.1.7

Simplify terms.

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Step 3.1.7.1

Combine

z

$z$ and

\frac{2}{2}

$\frac{2}{2}$ .

x = \frac{5}{2} - \frac{3 z}{2} + \frac{z \cdot 2}{2}

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

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 3.1.7.2

Combine the numerators over the common denominator.

x = \frac{5}{2} + \frac{- 3 z + z \cdot 2}{2}

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

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 3.1.7.3

Combine the numerators over the common denominator.

x = \frac{5 - 3 z + z \cdot 2}{2}

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

y = \frac{1}{2} + \frac{3 z}{2}

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

x = \frac{5 - 3 z + z \cdot 2}{2}

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

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 3.1.8

Move

2

$2$ to the left of

z

$z$ .

x = \frac{5 - 3 z + 2 z}{2}

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

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 3.1.9

Add

- 3 z

$- 3 z$ and

2 z

$2 z$ .

x = \frac{5 - z}{2}

$x = \frac{5 - z}{2}$

y = \frac{1}{2} + \frac{3 z}{2}

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

x = \frac{5 - z}{2}

$x = \frac{5 - z}{2}$

y = \frac{1}{2} + \frac{3 z}{2}

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

x = \frac{5 - z}{2}

$x = \frac{5 - z}{2}$

y = \frac{1}{2} + \frac{3 z}{2}

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

Step 4

Simplify the right side.

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Step 4.1

Reorder

\frac{1}{2}

$\frac{1}{2}$ and

\frac{3 z}{2}

$\frac{3 z}{2}$ .

y = \frac{3 z}{2} + \frac{1}{2}

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

x = \frac{5 - z}{2}

$x = \frac{5 - z}{2}$

y = \frac{3 z}{2} + \frac{1}{2}

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

x = \frac{5 - z}{2}

$x = \frac{5 - z}{2}$

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