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u - y = 9 dikalikan 2
menjadi
2u + 2y = 12
2u - 2y = 18 _
4y = -6
y = -6/4
y = - 3/2
ambl salah satu
2u+ 2y = 12
2u + 2(-3/2) =12
2u - 3 = 12
2u = 12+3
u = 15/2
maka tikik potongnya
u = 15/2 dan y = -3/2