Question

-x+2y=-8 y=-3

Answer 1

-x+2y=-3
-8y=-3

y=3/8
-x+3/4=-3
x=15/4

Answer 2

Put the value of 'y' in the equation as follows:
\[-x+2y=-8\]
\[-x+2(-3)=-8\]
\[-x+(-6)=-8\]
\[-x-6=-8\]
\[-x=-8+6\]
\[-x=-2\]
\[x=2\]