Jawabanmu

2014-04-15T19:15:48+07:00
Cari gradiennya:
m1 = -2

m1xm2 = -1
      m2 = 1/2

y-y1 = m(X-X1)
y-1   = 1/2(X-1)
y-1   = 1/2X -1/2
2y-2  = X-1
dipindah-pindah:
X-2y+1 = 0

jawabannya yang A

Semoga membantu :D
2014-04-15T19:24:32+07:00