Answer :
I would subsitute but hey, whatever floats your boat
minus y both sides in 1st equation and add to 2nd equation
-4x-y=0
6x+y=6 +
2x+0y=6
2x=6
divide 2
x=3
sub back
y=-4x
y=-4(3)
y=-12
(3,-12) is answer
minus y both sides in 1st equation and add to 2nd equation
-4x-y=0
6x+y=6 +
2x+0y=6
2x=6
divide 2
x=3
sub back
y=-4x
y=-4(3)
y=-12
(3,-12) is answer