Algebra Examples

$[\begin{array}{c} 1 & 0 & - 9 & - 2 \\ 0 & 1 & 8 & 1 \\ 0 & 0 & 0 & 0 \end{array}]$

Step 1

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$[\begin{array}{c} 1 & 0 & - 9 & - 2 \\ 0 & 1 & 8 & 1 \\ 0 & 0 & 0 & 0 \end{array}]$