Can somebody use elimination in this system of equation to solve it?

X-y = 4

x+3y = 36

To use elimination for this, you would have to multiply everything by negative 1 for the first equation because x is not the opposite of the other x.

x-y=4

x+3y=36

-1 (x-y) = 4*-1

-x+y=-4

x+3y=36

NOW you can use elimination

4y=32

y=8

-x+8=-4

-x=-12

x=12

Final Answer: (12,8)