Jawabanmu

2014-07-07T11:11:21+07:00
X₁ = 2 Y₁ = 1
m . m = -1
-2/5 m = -1
m = 5/2

y-y₁=m(x-x₁)
y-1 = 5/2(x-2)
2y-2=5x-10
2y=5x-8

:)

2014-07-07T12:06:45+07:00
5y = -2x+10
m1= -2/5
m2 = 5/2
persamaan garis :
y-y1 =m (x-x1)
y-1 = 5/2 (x-2)