## Elementary Linear Algebra 7th Edition

$x=13$ $y=12$
$\begin{pmatrix} -5 & x\\ y & 8 \end{pmatrix}=\begin{pmatrix} -5 & 13\\ 12 & 8 \end{pmatrix}$ All we need to do here is compare elements: $x=13$ $y=12$