Answer: 6, 12
-x+y=6 [eq.1]
2x + y = - 12 [eq.2]
[eq.2] - [eq.1]
2x + y - (-x) - y = - 12 - 6
2x +x =-18
3x=18
x = 18/3
ans: x = 6
substituting x=6 in [eq.1]
-x + y = 6
-6 +y =6
ans: y= 12
