[tex]\begin{gathered} \begin{bmatrix}x=9y \\ 2x-2y=-16\end{bmatrix} \\ 2\cdot\: 9y-2y=-16 \\ 18y-2y=-16 \\ 16y=-16 \\ \frac{16y}{16}=-\frac{16}{16} \\ y=-1 \end{gathered}[/tex]
then solve for x
[tex]\begin{gathered} x=9\mleft(-1\mright) \\ x=-9 \end{gathered}[/tex]
answer:
x = -9
y = -1
