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subtitusi ke pers. 2
2x-y = 9
2(1-3y)-y = 9
2-6y-y = 9
2-7y = 9
-7y = 7
y = -1
nilai x :
x = 1-3y
x = 1+3
x = 4
Jadi, nilai x = 4 dan y = -1