If you simply it down you get

so X can technically be any number
Answer:
x = -10
Step-by-step explanation:
9 x -10 = -90
X would be 0 while Y would be 4
3x+y=4
-(2x+y=4)
----------------
x=0
Plug in x to any of those two equations in their original form
3(0)+y=4
0 + y = 4
y = 4