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m1 = - a/b = -2/6 = - 1/3
syarat tegak lurus m1.m2 = -1
-1/3. m2 = -1
m2 = 3
Persamaan garis melalui titik (-4,-2) dengan m2 = 3
y - y1 = m2 (x - x1)
y + 2 = 3 ( x + 4)
y +2 = 3x + 12
y = 3x + 12 - 2
y = 3x + 10
m1 = -a/b = -(-2) / 6 = 1/3
m2 karena tegak lurus jadi dibalik semuanya m2 = b/a=3
y-y1 = m(x-x1)
y-(-2) = 3(x-(-4))
y+2 = 3x + 12
y = 3x + 10