Question

Persamaan garis yg melalui titik (1,-1) dan (-2,-3)
adalah
a.2x-3y=5 c.3x-4y=7
b.3x-2y=5 d. 4x-3y=7

Answer 1

Dik : x1 = 1          x2 = -2
       y1  = -1         y2 = -3

(y - y1) / (y2 - y1) = (x-x1) / (x2 - x1)
( y - (-1)) / (-3 - (-1)) = (x - 1) / (-2 - 1)
(y + 1) / -2 = (x-1) / -3
-3 (y + 1) = -2 (x - 1)  <<<< masing" kali -1
3 (y +1) = 2 (x - 1)
3y + 3 = 2x - 2
3 + 2 = 2x - 3y
5 = 2x -3y