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x-2y=6 |×1| x-2y=6
2x+y=4|×2| 4x+2y=8 (+)
5x = 15
x = 15/5
x = 3
3-2y=6
-2y=6-3
y=-3/2
b)
3x+2y=12
x+2y =4 (-)
2x = 8
x = 8/2
x = 4
3.4+2y=12
2y = 12-12
y = 2