Linear Algebra Examples

$[\begin{array}{c} 1 & - 1 & 1 & 2 \\ 2 & 1 & - 3 & 1 \\ - 1 & - 5 & 9 & 4 \end{array}]$

Step 1

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$[\begin{array}{c} 1 & - 1 & 1 & 2 \\ 2 & 1 & - 3 & 1 \\ - 1 & - 5 & 9 & 4 \end{array}]$