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Karena tegak lurus, maka gradiennya berbeda :
m₂ = -1 : m
= -1 : -2/3
= 3/2
y = mx - ( mx₁ - y₁ )
y = 3/2x - ( -6 - 4 )
y = 3/2x + 10
y = 3/2x + 20/2
2y = 3x + 20
3x - 2y + 20 = 0
cari m1=》2x+3y+12=0
3y=-12-2x
3y=-2x-12
y=-2x/3-12/3
y=mx+c
y=-2/3
cari m2=》m1×m2=-1
-2/3×m2=-1
m2=-1:-2/3
m2=-1×3/-2
m2=3/2
cari c=》 y=m2x+c
(-4,4) 4 =3/2(-4)+c
4=-6+c
6+4=c
10=c
Persamaan garis=》y=m2x+c
y=3/2x+10
---------×2
2y=3x+20
2y-3x=20
2y-3x-20=0