Linear Algebra Examples

$[\begin{array}{c} 1 & 2 \\ x + y & 4 \\ 7 & 2 y \end{array}] [\begin{array}{c} z & 2 \\ 9 & 4 \\ 7 & 8 \end{array}]$

Step 1

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$[\begin{array}{c} 1 & 2 \\ x + y & 4 \\ 7 & 2 y \end{array}] [\begin{array}{c} z & 2 \\ 9 & 4 \\ 7 & 8 \end{array}]$