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m = -2 : -4
m = 1/2
y = mx - ( mx₁ - y₁ )
y = 1/2x - ( 2 - (-1) )
y = 1/2x - 3
2y = x - 6
x - 2y = 6
Persamaan yang sejajar
x - 2y = 6
x - 2y = 5