Linear Algebra Examples

$[\begin{array}{c} 1 & 2 & 1 & 0 & 0 & 20 \\ 1 & 1 & 0 & 1 & 0 & 12 \\ 5 & 1 & 0 & 0 & 1 & 40 \\ - 20 & - 30 & 0 & 0 & 0 & 0 \end{array}]$

Step 1

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$[\begin{array}{c} 1 & 2 & 1 & 0 & 0 & 20 \\ 1 & 1 & 0 & 1 & 0 & 12 \\ 5 & 1 & 0 & 0 & 1 & 40 \\ - 20 & - 30 & 0 & 0 & 0 & 0 \end{array}]$