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m1.m2=-1
-3.1/3=-1
maka m2=1/3
y-y1=m(x-x1)
y+2=1/3(x+4)
y-1/3x=4/3-2
y-1/3x=-2/3
3y-x=-2
atau x-3y-2=0
x₁= -4 y₁= -2
2x + 6y - 16= 0
6y= -2x + 16
y= -2/6
y= -1/3 atau m₁= -1/3
Karena tegak lurus, maka :
m₁ . m₂= -1
-1/3 . m₂= -1
m₂= -1 : -1/3
m₂=-1 . -3
m₂= 3
y - y₁= m₂(x - x₁)
y - (-2)= 3(x - (-4)
y + 2= 3(x + 4)
y + 2= 3x + 12
y= 3x + 12 - 2
y= 3x + 10
atau
3x - y + 10= 0