Jawabanmu

2014-09-12T09:57:22+07:00
Diketahui x1 = 2, y1 = 1, dan m=-2
jawab :

m = (y-y1) / (x-x1)
-2 = (y-1) / (x-2)
y-1 = -2 (x-2)
y = -2x + 2 + 1
  = -2x + 3
Persamaan garis : y = -2x + 3