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y = 3x + 1 --------> m1 = 3
syarat ⊥ : m1 x m2 = - 1
3 x m2 = - 1
m2 = - 1/3
melalui (- 1 , 2)
y - y1 = m2 (x - x1)
y - 2 = - 1/3 (x - - 1)
y - 2 = - 1/3 (x + 1) ......... kalikan dengan 3
3y - 6 = - 1 (x + 1)
3y - 6 = - x - 1
3y + x - 6 + 1 = 0
3y + x - 5 = 0
m1=3
⊥ m2 ⇒ m1 x m2 = -1
m2 = -1/3
y-2=-1/3(x+1)
3y-6=-x-1
x+3y-5=0