Linear Algebra Examples

$[\begin{array}{c} 1 & 2 & 0 & 4 \\ 3 & - 1 & 0 & 0 \\ 0 & 0 & 1 & 7 \end{array}] [\begin{array}{c} 5 & 2 & 6 \\ 2 & 3 & 1 \\ 6 & 1 & - 2 \end{array}]$

Step 1

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$[\begin{array}{c} 1 & 2 & 0 & 4 \\ 3 & - 1 & 0 & 0 \\ 0 & 0 & 1 & 7 \end{array}] [\begin{array}{c} 5 & 2 & 6 \\ 2 & 3 & 1 \\ 6 & 1 & - 2 \end{array}]$