Linear Algebra Examples

$[\begin{array}{c} - \frac{2}{6.5} & \frac{2}{7} & 0 & 0 \\ - \frac{6}{6.5} & - \frac{6}{7} & \frac{6}{6.5} & 0 \\ \frac{1.5}{6.5} & \frac{3}{7} & \frac{2.5}{6.5} & - 300 \end{array}]$

Step 1

Divide $2$ by $6.5$ .

$[\begin{array}{c} - 1 \cdot 0.\overline{307692} & \frac{2}{7} & 0 & 0 \\ - \frac{6}{6.5} & - \frac{6}{7} & \frac{6}{6.5} & 0 \\ \frac{1.5}{6.5} & \frac{3}{7} & \frac{2.5}{6.5} & - 300 \end{array}]$

Step 2

Multiply $- 1$ by $0.\overline{307692}$ .

$[\begin{array}{c} - 0.\overline{307692} & \frac{2}{7} & 0 & 0 \\ - \frac{6}{6.5} & - \frac{6}{7} & \frac{6}{6.5} & 0 \\ \frac{1.5}{6.5} & \frac{3}{7} & \frac{2.5}{6.5} & - 300 \end{array}]$

Step 3

Divide $6$ by $6.5$ .

$[\begin{array}{c} - 0.\overline{307692} & \frac{2}{7} & 0 & 0 \\ - 1 \cdot 0.\overline{923076} & - \frac{6}{7} & \frac{6}{6.5} & 0 \\ \frac{1.5}{6.5} & \frac{3}{7} & \frac{2.5}{6.5} & - 300 \end{array}]$

Step 4

Multiply $- 1$ by $0.\overline{923076}$ .

$[\begin{array}{c} - 0.\overline{307692} & \frac{2}{7} & 0 & 0 \\ - 0.\overline{923076} & - \frac{6}{7} & \frac{6}{6.5} & 0 \\ \frac{1.5}{6.5} & \frac{3}{7} & \frac{2.5}{6.5} & - 300 \end{array}]$

Step 5

Divide $6$ by $6.5$ .

$[\begin{array}{c} - 0.\overline{307692} & \frac{2}{7} & 0 & 0 \\ - 0.\overline{923076} & - \frac{6}{7} & 0.\overline{923076} & 0 \\ \frac{1.5}{6.5} & \frac{3}{7} & \frac{2.5}{6.5} & - 300 \end{array}]$

Step 6

Divide $1.5$ by $6.5$ .

$[\begin{array}{c} - 0.\overline{307692} & \frac{2}{7} & 0 & 0 \\ - 0.\overline{923076} & - \frac{6}{7} & 0.\overline{923076} & 0 \\ 0.\overline{230769} & \frac{3}{7} & \frac{2.5}{6.5} & - 300 \end{array}]$

Step 7

Divide $2.5$ by $6.5$ .

$[\begin{array}{c} - 0.\overline{307692} & \frac{2}{7} & 0 & 0 \\ - 0.\overline{923076} & - \frac{6}{7} & 0.\overline{923076} & 0 \\ 0.\overline{230769} & \frac{3}{7} & 0.\overline{384615} & - 300 \end{array}]$

Step 8

Multiply each element of $R_{1}$ by $\frac{1}{- 0.\overline{307692}}$ to make the entry at $1, 1$ a $1$ .

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Step 8.1

Multiply each element of $R_{1}$ by $\frac{1}{- 0.\overline{307692}}$ to make the entry at $1, 1$ a $1$ .

$[\begin{array}{c} \frac{- 0.\overline{307692}}{- 0.\overline{307692}} & \frac{\frac{2}{7}}{- 0.\overline{307692}} & \frac{0}{- 0.\overline{307692}} & \frac{0}{- 0.\overline{307692}} \\ - 0.\overline{923076} & - \frac{6}{7} & 0.\overline{923076} & 0 \\ 0.\overline{230769} & \frac{3}{7} & 0.\overline{384615} & - 300 \end{array}]$

Step 8.2

Simplify $R_{1}$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ - 0.\overline{923076} & - \frac{6}{7} & 0.\overline{923076} & 0 \\ 0.\overline{230769} & \frac{3}{7} & 0.\overline{384615} & - 300 \end{array}]$

Step 9

Perform the row operation $R_{2} = R_{2} + 0.\overline{923076} R_{1}$ to make the entry at $2, 1$ a $0$ .

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Step 9.1

Perform the row operation $R_{2} = R_{2} + 0.\overline{923076} R_{1}$ to make the entry at $2, 1$ a $0$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ - 0.\overline{923076} + 0.\overline{923076} \cdot 1 & - \frac{6}{7} + 0.\overline{923076} \cdot - 0.9\overline{285714} & 0.\overline{923076} + 0.\overline{923076} \cdot 0 & 0 + 0.\overline{923076} \cdot 0 \\ 0.\overline{230769} & \frac{3}{7} & 0.\overline{384615} & - 300 \end{array}]$

Step 9.2

Simplify $R_{2}$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ 0 & - \frac{12}{7} & 0.\overline{923076} & 0 \\ 0.\overline{230769} & \frac{3}{7} & 0.\overline{384615} & - 300 \end{array}]$

Step 10

Perform the row operation $R_{3} = R_{3} - 0.\overline{230769} R_{1}$ to make the entry at $3, 1$ a $0$ .

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Step 10.1

Perform the row operation $R_{3} = R_{3} - 0.\overline{230769} R_{1}$ to make the entry at $3, 1$ a $0$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ 0 & - \frac{12}{7} & 0.\overline{923076} & 0 \\ 0.\overline{230769} - 0.\overline{230769} \cdot 1 & \frac{3}{7} - 0.\overline{230769} \cdot - 0.9\overline{285714} & 0.\overline{384615} - 0.\overline{230769} \cdot 0 & - 300 - 0.\overline{230769} \cdot 0 \end{array}]$

Step 10.2

Simplify $R_{3}$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ 0 & - \frac{12}{7} & 0.\overline{923076} & 0 \\ 0 & 0.6\overline{428571} & 0.\overline{384615} & - 300 \end{array}]$

Step 11

Multiply each element of $R_{2}$ by $- \frac{7}{12}$ to make the entry at $2, 2$ a $1$ .

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Step 11.1

Multiply each element of $R_{2}$ by $- \frac{7}{12}$ to make the entry at $2, 2$ a $1$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ - \frac{7}{12} \cdot 0 & - \frac{7}{12} (- \frac{12}{7}) & - \frac{7}{12} \cdot 0.\overline{923076} & - \frac{7}{12} \cdot 0 \\ 0 & 0.6\overline{428571} & 0.\overline{384615} & - 300 \end{array}]$

Step 11.2

Simplify $R_{2}$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ 0 & 1 & - 0.\overline{538461} & 0 \\ 0 & 0.6\overline{428571} & 0.\overline{384615} & - 300 \end{array}]$

Step 12

Perform the row operation $R_{3} = R_{3} - 0.6\overline{428571} R_{2}$ to make the entry at $3, 2$ a $0$ .

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Step 12.1

Perform the row operation $R_{3} = R_{3} - 0.6\overline{428571} R_{2}$ to make the entry at $3, 2$ a $0$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ 0 & 1 & - 0.\overline{538461} & 0 \\ 0 - 0.6\overline{428571} \cdot 0 & 0.6\overline{428571} - 0.6\overline{428571} \cdot 1 & 0.\overline{384615} - 0.6\overline{428571} \cdot - 0.\overline{538461} & - 300 - 0.6\overline{428571} \cdot 0 \end{array}]$

Step 12.2

Simplify $R_{3}$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ 0 & 1 & - 0.\overline{538461} & 0 \\ 0 & 0 & 0.7\overline{307692} & - 300 \end{array}]$

Step 13

Multiply each element of $R_{3}$ by $\frac{1}{0.7\overline{307692}}$ to make the entry at $3, 3$ a $1$ .

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Step 13.1

Multiply each element of $R_{3}$ by $\frac{1}{0.7\overline{307692}}$ to make the entry at $3, 3$ a $1$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ 0 & 1 & - 0.\overline{538461} & 0 \\ \frac{0}{0.7\overline{307692}} & \frac{0}{0.7\overline{307692}} & \frac{0.7\overline{307692}}{0.7\overline{307692}} & \frac{- 300}{0.7\overline{307692}} \end{array}]$

Step 13.2

Simplify $R_{3}$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ 0 & 1 & - 0.\overline{538461} & 0 \\ 0 & 0 & 1 & - 410.52631578 \end{array}]$

Step 14

Perform the row operation $R_{2} = R_{2} + 0.\overline{538461} R_{3}$ to make the entry at $2, 3$ a $0$ .

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Step 14.1

Perform the row operation $R_{2} = R_{2} + 0.\overline{538461} R_{3}$ to make the entry at $2, 3$ a $0$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ 0 + 0.\overline{538461} \cdot 0 & 1 + 0.\overline{538461} \cdot 0 & - 0.\overline{538461} + 0.\overline{538461} \cdot 1 & 0 + 0.\overline{538461} \cdot - 410.52631578 \\ 0 & 0 & 1 & - 410.52631578 \end{array}]$

Step 14.2

Simplify $R_{2}$ .

$[\begin{array}{c} 1 & - 0.9\overline{285714} & 0 & 0 \\ 0 & 1 & 0 & - 221.05263157 \\ 0 & 0 & 1 & - 410.52631578 \end{array}]$

Step 15

Perform the row operation $R_{1} = R_{1} + 0.9\overline{285714} R_{2}$ to make the entry at $1, 2$ a $0$ .

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Step 15.1

Perform the row operation $R_{1} = R_{1} + 0.9\overline{285714} R_{2}$ to make the entry at $1, 2$ a $0$ .

$[\begin{array}{c} 1 + 0.9\overline{285714} \cdot 0 & - 0.9\overline{285714} + 0.9\overline{285714} \cdot 1 & 0 + 0.9\overline{285714} \cdot 0 & 0 + 0.9\overline{285714} \cdot - 221.05263157 \\ 0 & 1 & 0 & - 221.05263157 \\ 0 & 0 & 1 & - 410.52631578 \end{array}]$

Step 15.2

Simplify $R_{1}$ .

$[\begin{array}{c} 1 & 0 & 0 & - 205.26315789 \\ 0 & 1 & 0 & - 221.05263157 \\ 0 & 0 & 1 & - 410.52631578 \end{array}]$