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2x + y = 11
Dan,
x - y = -2
y = x + 2
Sehingga,
2x + y = 11
2x + (x+2) = 11
3x + 2 = 11
3x = 9
x = 3
Maka,
y = x + 2
y = 3 + 2
y = 5
2x+y=11
x-y=-2
________
3x=9
x=3
x-y=-2
3-y=-2
-y=-2-3
y=5