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x + y = 5
2x - y = 4
__________ +
3x = 7
x = 7/3
7/3 + y = 5
y = 5 - 7/3
y = ...
2. dg cara yang sama
x - 3y = 8
2x + 3y = 10
____________ +
3x = 18
x = 6
2 (6) + 3y = 10
12 + 3y = 10
3y = 10-12
3y = -2
y = -2/3