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x + 2y = 8..............(2)
3x + y = 9 *dikalikan 2
x + 2y = 8
6x + 2y =18
x + 2y = 8
__________ _
5x = 10
x = 2
masukkan persamaan 2
x + 2y = 8
(2) + 2y = 8
2y = 6
y = 3
maka koor dinat titik potongnya (x,y) (2,3)