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2x + y = 0 |x2
--------------------
4x - 2y = 12
4x + y = 0
-------------------- kurang
-3y = -12
y = 4
subsitusikan ke pers salah satu
2x + y = 0
2x + (4) =0
2x= -4
x = -2
jadi (x,y) = (-2, 4)