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x₁= 3 y₁= 2
x + 3y= 5
3y= -x + 5
3y= -1/3 atau m₁= -1/3
karena tegak lurus, maka :
m₁ . m₂= -1
-1/3 . m₂= -1
m₂= -1 : -1/3
m₂= -1 . -3/1
m₂= 3
y - y₁= m₂(x - x₁)
y - 2= 3(x - 3)
y - 2= 3x - 9
y= 3x - 9 + 2
y= 3x - 7
atau
3x - y - 7= 0