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