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Cara mudah:
Ax+By = Ax₁+By₁
4x + 2y = 4(2)+2(-5)
4x + 2y = 8-10
4x + 2y = -2
2x + y = -1
y = -2x - 1 [B]
y = mx - ( mx₁ - y₁ )
y = -2x - ( -4 + 5 )
y = -2x - 1