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Garis 3x - y + 12 = 0
m1 = -a/b = -3 / (-1) = 3
Sejajar --> m1 = m2 = 3
Persamaan garis
y - y1 = m2 (x - x1)
y + 1 = 3 (x - 4)
y + 1 = 3x - 12
y = 3x - 12 - 1
y = 3x - 13
-y = -3x-12
y = 3x+12
m1=3=m2
(4,-1) x1=4, y1=-1
y-y1 = m2(x-x1)
y-(-1) = 3(x-4)
y+1 = 3x-12
y = 3x-12+1
y = 3x-11
atau
-3x+y+11= 0
3x-y-11=0