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x₁= 4 y₁= -1
6x - 4y + 2= 0
-4y= -6x - 2
y= -6/-4
y= 3/2 atau m₁= 3/2
karena yegak lurus, maka :
m₁ . m₂= -1
3/2 . m₂= -1
m₂= -1 : 3/2
m₂= -1 . 2/3
m₂= -2/3
y - y₁= m₂(x - x₁)
y - (-1)= -2/3(x - 4)
y + 1= -2/3x + 8/3
3y + 3= -2x + 8
3y= -2x + 8 - 3
3y= -2x + 5
atau
2x + 3y - 5= 0