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x+y = 1 dan x+2y= 4
menggunakan cara eliminasi
x+y = 1
x+2y= 4
------------- --
-y = -3
y = 3
subtitusikan nilai y
x+y=1
x+3 = 1
x = 1-3
x= -2
jadi nilai x dan y adalah -2 dan 3 (C)