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x₁= 1 y₁= -3
4y - 2x= 8
4y= 2x + 8
y= 2/4
y= 1/2 atau m₁= 1/2
Karene tegak lurus, maka :
m₁ . m₂= -1
1/2 . m₂= -1
m₂= -1 : 1/2
m₂= -1 . 2
m₂= -2
y - y₁= m₂(x - x₁)
y - (-3)= -2(x - 1)
y + 3= -2x + 2
y= -2x + 2 - 3
y= -2x - 1
atau
2x + y= -1