Precalculus Examples

$[\begin{array}{c} 1 & 1 & 1 & 15 \\ 0 & 2 & 1 & 14 \\ 1 & 2 & 1 & 19 \end{array}]$

Step 1

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$[\begin{array}{c} 1 & 1 & 1 & 15 \\ 0 & 2 & 1 & 14 \\ 1 & 2 & 1 & 19 \end{array}]$