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x - 2y = 4
x = 4 + 2y
Metode Subtitusi
4x + 2y = 6
4(4 + 2y) + 2y = 6
16 + 8y + 2y = 6
8y + 2y = 6 - 16
10y = -10
y = -10/10
y = -1
Masukkan y
x = 4 + 2y
x = 4 + 2(-1)
x = 4 - 2
x = 2
Jadi, HP = {-1, 2}