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x + 2y = 4
3x - y = -9
(dikali 2 di persamaan kedua utk menyamakan variabel y)
x + 2y = 4
6x - 2y = -18
7x = -14
x = -2
utk mencari titik y nya tinggi di substitusikan ke persamaan
-2 + 2y = 4
2y = 6
y = 3
Jadi titik potongnya yaitu di titik (-2, 3)