Algebra Examples

$[\begin{array}{c} 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\ 2.1 & 3.2 & 6.8 & 7.3 & 11.2 & 12.6 & 13.4 & 15.9 \end{array}]$

Step 1

Perform the row operation $R_{2} = R_{2} - 2.1 R_{1}$ to make the entry at $2, 1$ a $0$ .

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Step 1.1

Perform the row operation $R_{2} = R_{2} - 2.1 R_{1}$ to make the entry at $2, 1$ a $0$ .

$[\begin{array}{c} 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\ 2.1 - 2.1 \cdot 1 & 3.2 - 2.1 \cdot 2 & 6.8 - 2.1 \cdot 3 & 7.3 - 2.1 \cdot 4 & 11.2 - 2.1 \cdot 5 & 12.6 - 2.1 \cdot 6 & 13.4 - 2.1 \cdot 7 & 15.9 - 2.1 \cdot 8 \end{array}]$

Step 1.2

Simplify $R_{2}$ .

$[\begin{array}{c} 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\ 0 & - 1 & 0.5 & - 1.1 & 0.7 & 0 & - 1.3 & - 0.9 \end{array}]$

Step 2

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

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Step 2.1

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

$[\begin{array}{c} 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\ - \frac{1}{1} \cdot 0 & - \frac{1}{1} \cdot - 1 & - \frac{1}{1} \cdot 0.5 & - \frac{1}{1} \cdot - 1.1 & - \frac{1}{1} \cdot 0.7 & - \frac{1}{1} \cdot 0 & - \frac{1}{1} \cdot - 1.3 & - \frac{1}{1} \cdot - 0.9 \end{array}]$

Step 2.2

Simplify $R_{2}$ .

$[\begin{array}{c} 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\ 0 & 1 & - 0.5 & 1.1 & - 0.7 & 0 & 1.3 & 0.9 \end{array}]$

Step 3

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

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Step 3.1

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

$[\begin{array}{c} 1 - 2 \cdot 0 & 2 - 2 \cdot 1 & 3 - 2 \cdot - 0.5 & 4 - 2 \cdot 1.1 & 5 - 2 \cdot - 0.7 & 6 - 2 \cdot 0 & 7 - 2 \cdot 1.3 & 8 - 2 \cdot 0.9 \\ 0 & 1 & - 0.5 & 1.1 & - 0.7 & 0 & 1.3 & 0.9 \end{array}]$

Step 3.2

Simplify $R_{1}$ .

$[\begin{array}{c} 1 & 0 & 4 & 1.8 & 6.4 & 6 & 4.4 & 6.2 \\ 0 & 1 & - 0.5 & 1.1 & - 0.7 & 0 & 1.3 & 0.9 \end{array}]$