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y = x - 1 maka y = x - 1
sy pakai substitusi ya.
y + x = 2
(x - 1) + x = 2
2x - 1 = 2
2x = 3
x = 3/2
y = x - 1 = 3/2 - 1 = 1/2
jadi titik potong nya (3/2, 1/2)
jawabannya A