Question

Tentkn gradien garis yg melalui ttik2 d bwh ini & tlskan pers.grsnnya
a. (4, -5) dan (1, -4)
b. (-1, -2) dan (4, 6)

Answer 1

A) y2 - y1 = m(x2 - x1)
-4 - (-5) = m(1 - 4)
1 = -3m
m = -1/3
y - y1 = m(x - x1)
y - (-5) = -⅓(x - 4)
y + 5 = -⅓x + 4/3
y = -⅓x + 4/3 - 5
--------------------- (×3)
3y = -x + 4 - 15
3y = -x - 11
b) y2 - y1 = m (x2 - x1)
6 - (-1) = m (4 - (-1)
7 = 5m
m = 7/5
y - y1 = m (x - x1)
y - (-2) = 7/5 (x - (-1)
y + 2 = 7/5x + 7/5
y = 7/5 x + 7/5 - 2
----------------------- (×5)
5y = 7x + 7 - 10
5y = 7x - 3