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5x + y = -5
2x + y = -2
_________ _
3x = -3
x = -3 : 3
x = -1
kmdian dgn metode substitusi
2x+y = -2
2(-1) + y = -2
-2 + y = -2
y = -2 +2
y = 0
jadi hp = { -1, 0}