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x + 1 = y
x = y - 1.......persamaan (2)
substitusi kn persamaan (2) ke (1)
x + y = 5
(y-1) + y = 5
2y - 1 = 5
2y = 6
y = 3
x + y = 5
x + 3 = 5
x = 2
x = 2
y = 3
hp (2,3)