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(y - 1)/(-7-1) = (x - 2)/(-2-2)
(y - 1)/-8 = (x - 2)/-4
(y - 1)/2 = (x - 2)
y - 1 = 2x - 4
2x - y - 3 = 0
= (-7 - 1) / (-2 - 2)
= (-8) / (-4)
= 2
syarat tegak lurus
m1 . m2 = -1
2 . m2 = -1
m2 = -1/2
persamaan garis
y - y1 = m2(x - x1)
y - 1 = -1/2 (x - 2)
2 y - 2 = -x + 2
x + 2y = 4