Diketahui titik (3,4) dan titik (8,3) tentukan a.gradien b.persamaan garisnya

Persamaan garis melalui (3,4) dan (8,3) :

y – y1 = (y2 – y1)/(x2 – x1) (x – x1)
y – 4 = (3 – 4)/(8 – 3) (x – 3)
y – 4 = -1/5 (x – 3)
kali silang
5y – 20 = -x + 3
x + 5y – 23 = 0

gradien = m = -a/b = -1/5

A. gradien (m) = y2-y1 / x2-x1 = 3-4 / 8-3 = -1/5

b. y-y1 = m(x-x1)
y-4 = -1/5(x-3)
-5y+20 = x-3
x+5y-23=0