Persamaan garis lurus yang melalui titik (-2,-4) dan titik (-4,3) adalah

Jawab :

m = y2 - y1/ x2 - x1 = 3 -(-4) / (-4) - (-2) = 7/2

y - y1 = m(x - x1)
y - (-4) = 7/2 (x - (-2))
y + 4 = 7/2 (x + 2 )
y + 4 = 7/2x - 7/2 x 2
y + 4 = 7/2x - 14/2
-------------------------- x 2
2.y + 4 . 2 = 7/2x . 2 - 14/2 . 2

2y + 8 = 7x - 14
2y + 8 - 7x + 14 = 0
2y - 7x + 22 = 0 => -7x + 2y + 22 = 0 => ax + by + c = 0