Chapter 10 - 10.2 - Operations with Matrices - 10.2 Exercises - Page 724: 7

$x=-1$ $y=3$

Two matrices are equal only if the values in the same position are equal. That is, if $A=B$, $a_{11}=b_{11}, a_{12}=b_{12},a_{21}=b_{21},...,a_{ij}=b_{ij}$ $x=2x+1$ $x-2x=1$ $-x=1$ $x=-1$ $3y-5=4$ $3y=9$ $y=\frac{9}{3}=3$