Chapter 10 - 10.2 - Operations with Matrices - 10.2 Exercises - Page 724: 8

$x=-4$ $y=-6$

Two matrices are equal only if the values in the same position are equal. That is, if $A=B$, $a_{11}=b_{11}, a_{12}=b_{12},a_{21}=b_{21},...,a_{ij}=b_{ij}$ $x+2=2x+6$ $x-2x=6-2$ $-x=4$ $x=-4$ $y+2=x$ $y+2=-4$ $y=-4-2$ $y=-6$