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penyelesaian:
(4x + 2y = 10) dikali 2 menjadi 8x + 4y = 20
maka
lalu 4x + 2y = 10
4(1) + 2y = 10
2y = 10 - 4
y = 6 : 2
y = 3
jadi : x1y1 = 1 x 3 = 3
x1y1 = 3