jelaskan persamaan garis yang melalui titik -3,2 & 5,-1

Jawab :

y2 - y1/ x2 - x1 = (-1) - 2/ 5 - (-3) = -3/8 = - 3/8

Persamaannya :

y - y1 = m(x - x1)
y - 2 = - 3/8(x - (-3))
y - 2 = - 3/8(x + 3)
y - 2 = - 3/8x + 3/8 x 3
y - 2 = - 3/8 + 9/8
---------------------------------- x 8
8.y - 2. 8 = - 3/8x . 8 + 9/8 . 8

8y - 16 = - 3x + 9
8y - 16 + 3x - 9 = 0
8y + 3x - 25 = 0 
3x + 8y - 25 = 0 => ax + by + c = 0