persamaan garis yang melalui titik (-4,7) dan titik (10,-1) adalah..

(y-7) / (-1-7) = (x -(-4) / (10 -(-4)
(y - 7) / -8 = (x +4) / 14
14 (y-7) = -8 (x+4)
14 y - 98 = -8x - 32
14 y = -8x + 66
7y = -4 x + 33
7y + 4x - 33 = 0

y - y1 / y2 - y1 = x - x1 / x2 - x1
y - 7 / -1 -7 = x + 4 / 10 + 4
y - 7 / -8 = x + 4 / 14
14 (y - 7) = -8 (x + 4)
14 y - 98 = -8x - 32
14y = -8x -32 + 98
14 y = -8x + 66