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Titik (-1,4) -> X2 = -1 dan Y2 = 4.
m1 = Y1 - Y2 per X1 - X2
= 2 - 4 per 3 - (-1) = -2 per 4
Syarat tegak lurus :
m1 x m2 = -1
-2 per 4 x m2 = -1
m2 = -1 x 4 per -2 = 4 per 2 = 2
Persamaan garis = 2x - 7 = y
y-2 / 4-2 = x-3 / -1-3
y-2 / 2 = x-3 / -4
-4y+8 = 2x-6
-4y = 2x-14
-2y = x-7
2y+x-7 = 0