Jawabanmu

2014-04-29T19:50:40+07:00
X-x1/x2-x1 = y-y1/y2-y1
x-1/3-1 =y-(-5)/2-(-5)
x-1/2=y+5/7
7x-7=2y+10
7x-2y=10+7
7x-2y=17 
jadi jawaban nya yang option A