Question

Tentukan pgl yang melalui (2,3) dan tegak lurus dengan garis yang melalui (-1,2) dan (4,-3)

Answer 1

(y - y1) / (y2 - y1) = (x - x1) / (x2 - x1)
(y - 2) / (-3 - 2) = (x + 1) / (4 + 1)
(y - 2) / -5 = (x + 1) / 5
5 (y - 2) = -5 (x + 1)
5y - 10 = -5x - 5
5y = -5x - 5 + 10
5y = -5x + 5
y = -x + 1
m = -1

m1 . m2 = -1
-1 . m2 = -1
m2 = -1 / -1
m2 = 1

y = m(x - x1) + y1
y = 1(x - 2) + 3
y = x - 2 + 3
y = x + 1