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3x-y=9 (dieliminasi dengan ditambah)
8x=16, x=2
5x+y=7, 10+y=7, y=(-3)
maka x+y = 2 + (-3) = (-1)
3x - y = 9
(ditambah)
hasilnya? 8x = 16
x = 2
5x + y = 7
5(2) + y =7
y= -3
nilai x+y = 2 + (-3) = -1