Examples

x - [\begin{array}{c} 1 & - 12 & 0 \\ 10 & 9 & 1 \end{array}] = [\begin{array}{c} - 2 & 12 & 2 \\ - 8 & \frac{3}{2} & 4 \end{array}]

$x - [\begin{array}{c} 1 & - 12 & 0 \\ 10 & 9 & 1 \end{array}] = [\begin{array}{c} - 2 & 12 & 2 \\ - 8 & \frac{3}{2} & 4 \end{array}]$

Step 1

Move all terms not containing a variable to the right side.

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Step 1.1

Add

[\begin{array}{c} 1 & - 12 & 0 \\ 10 & 9 & 1 \end{array}]

$[\begin{array}{c} 1 & - 12 & 0 \\ 10 & 9 & 1 \end{array}]$ to both sides of the equation.

x = [\begin{array}{c} - 2 & 12 & 2 \\ - 8 & \frac{3}{2} & 4 \end{array}] + [\begin{array}{c} 1 & - 12 & 0 \\ 10 & 9 & 1 \end{array}]

$x = [\begin{array}{c} - 2 & 12 & 2 \\ - 8 & \frac{3}{2} & 4 \end{array}] + [\begin{array}{c} 1 & - 12 & 0 \\ 10 & 9 & 1 \end{array}]$

x = [\begin{array}{c} - 2 & 12 & 2 \\ - 8 & \frac{3}{2} & 4 \end{array}] + [\begin{array}{c} 1 & - 12 & 0 \\ 10 & 9 & 1 \end{array}]

$x = [\begin{array}{c} - 2 & 12 & 2 \\ - 8 & \frac{3}{2} & 4 \end{array}] + [\begin{array}{c} 1 & - 12 & 0 \\ 10 & 9 & 1 \end{array}]$

Step 2

Simplify the right side.

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Step 2.1

Add the corresponding elements.

x = [\begin{array}{c} - 2 + 1 & 12 - 12 & 2 + 0 \\ - 8 + 10 & \frac{3}{2} + 9 & 4 + 1 \end{array}]

$x = [\begin{array}{c} - 2 + 1 & 12 - 12 & 2 + 0 \\ - 8 + 10 & \frac{3}{2} + 9 & 4 + 1 \end{array}]$

Step 2.2

Simplify each element.

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Step 2.2.1

Add

- 2

$- 2$ and

1

$1$ .

x = [\begin{array}{c} - 1 & 12 - 12 & 2 + 0 \\ - 8 + 10 & \frac{3}{2} + 9 & 4 + 1 \end{array}]

$x = [\begin{array}{c} - 1 & 12 - 12 & 2 + 0 \\ - 8 + 10 & \frac{3}{2} + 9 & 4 + 1 \end{array}]$

Step 2.2.2

Subtract

12

$12$ from

12

$12$ .

x = [\begin{array}{c} - 1 & 0 & 2 + 0 \\ - 8 + 10 & \frac{3}{2} + 9 & 4 + 1 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 + 0 \\ - 8 + 10 & \frac{3}{2} + 9 & 4 + 1 \end{array}]$

Step 2.2.3

Add

2

$2$ and

0

$0$ .

x = [\begin{array}{c} - 1 & 0 & 2 \\ - 8 + 10 & \frac{3}{2} + 9 & 4 + 1 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 \\ - 8 + 10 & \frac{3}{2} + 9 & 4 + 1 \end{array}]$

Step 2.2.4

Add

- 8

$- 8$ and

10

$10$ .

x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{3}{2} + 9 & 4 + 1 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{3}{2} + 9 & 4 + 1 \end{array}]$

Step 2.2.5

To write

9

$9$ as a fraction with a common denominator, multiply by

\frac{2}{2}

$\frac{2}{2}$ .

x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{3}{2} + 9 \cdot \frac{2}{2} & 4 + 1 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{3}{2} + 9 \cdot \frac{2}{2} & 4 + 1 \end{array}]$

Step 2.2.6

Combine

9

$9$ and

\frac{2}{2}

$\frac{2}{2}$ .

x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{3}{2} + \frac{9 \cdot 2}{2} & 4 + 1 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{3}{2} + \frac{9 \cdot 2}{2} & 4 + 1 \end{array}]$

Step 2.2.7

Combine the numerators over the common denominator.

x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{3 + 9 \cdot 2}{2} & 4 + 1 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{3 + 9 \cdot 2}{2} & 4 + 1 \end{array}]$

Step 2.2.8

Simplify the numerator.

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Step 2.2.8.1

Multiply

9

$9$ by

2

$2$ .

x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{3 + 18}{2} & 4 + 1 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{3 + 18}{2} & 4 + 1 \end{array}]$

Step 2.2.8.2

Add

3

$3$ and

18

$18$ .

x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{21}{2} & 4 + 1 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{21}{2} & 4 + 1 \end{array}]$

x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{21}{2} & 4 + 1 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{21}{2} & 4 + 1 \end{array}]$

Step 2.2.9

Add

4

$4$ and

1

$1$ .

x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{21}{2} & 5 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{21}{2} & 5 \end{array}]$

x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{21}{2} & 5 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{21}{2} & 5 \end{array}]$

x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{21}{2} & 5 \end{array}]

$x = [\begin{array}{c} - 1 & 0 & 2 \\ 2 & \frac{21}{2} & 5 \end{array}]$

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