Question

Persamaan garis yang melalui titik (-3, 2) dan (1, -2) adalah...
a. y-x+1 = 0
b. y+x+1 = 0
c. y-x+5 = 0
d. y-x-5 = 0

Answer 1

(y-y1)/(y2-y1) = (x-x1)/(x2-x1)
(y-2)/(-2-2) = (x+3)/(1+3)
(y-2)/-4 = (x+3)/4
-(y-2) = x+3
x+3+y-2 = 0
y+x+1 = 0

Answer 2

Rumus : cari m nya dahulu :
m = y2-y1/x2-x1 = -2-2/1+3
m = -4/4
m = -1
y-y1 = m(x-x1)
y-2 = -1(x+3)
y-2 = -x-3
y = -x-1
atau y+x+1 = 0/B