## Precalculus (6th Edition) Blitzer

$x=12,y=2\text{ and }z=3$.
Two matrices are equal if the corresponding elements of the given matrix are equal. That is, \begin{align} & x=12 \\ & y+3=5 \\ \end{align} And, $2z=6$ Now $y+3=5$ implies that $y=5-3=2$ and $2z=6$ implies that $z=3$. Hence, $x=12,y=2\text{ and }z=3$.