Tolong di jawab ya. Tulislah persamaan garis yang melewati titik (1,3) dan (8,-5)

x1 = 1
x2 = 8
y1 = 3
y2 = 5

y - y1 x - x1
______ = _______
y2 - y1 x2 - x1

y - 3 x - 1
_____ = _____
5 - 3 8 - 1

y - 3 x - 1
_____ = _____
2 7

(y-3). 7 = (x - 1). 2
7y - 21 = 2x - 2
7y = 2x - 2 + 21
7y = 2x + 19

(y-y1)/(y2-y1)=(x-x1)/(x2-x1)
(y-3)/(-5-3)=(x-1)/(8-1)
7y-21=-8x+8
7y=-8x+29