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x2 = -4
y1 = -2
y2 = 1
m1 = y2 - y1 / x2 - x1
= 1 + 2 / -4 - 2
= 3 / -6
= -1/2
m2 = + 2/1 = 2
Persamaan Garis tegak lurus =
y - y1 = m²(x - x1)
y + 2 = 2 (x - 2)
y + 2 = 2x + 4
y = 2x + 4 - 2
y = 2x + 2
atau
y - 2x = 2
atau
y - 2x - 2 = 0
m = 1+2/-4-2 = 3/-6 = -1/2
m1.m2 = -1
-1/2.m2 = -1
m2 = 2
y-y1 = m(x-x1)
y+2 = 2(x-2)
y = 2x-4-2
y= 2x-6