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B : persamaan dlm ax+by=c --> x+3y = -1
x=2y-5
kita masukkan dalam persamaan 2 :
x+3y+1=0
(2y-5)+3y+1 = 0
5y-4 = 0
5y = 4
y = 0.8 --> masukkan ke persamaan 1:
x=2y-5
= 1.6 - 5
= -3.4