Jawabanmu

2014-03-07T22:24:57+07:00
M1 = 1/2
M1*M2 = -1
M2 = -1:1/2 = -2
y-y1=M2(x-x1)
y-1= -2(x+2)
y-1= -2x - 4
y = -2x -3
1 5 1