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4x + y = 4
2x + 3y = 6 |×2| ----> 4x + 6y = 12
eliminasi
4x + 6y = 12
4x + y = 4
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5y = 8
y = 8/5
4x + 8/5 = 4
4x = 12/5
x = 12/20 = 3/5

8/5 + 3/5 = 11/5 = 2(1/5)