Question

If the middle points of the sides BC, CA and AB of the triangle ABC be (1, 3), (5, 7) and (-5, 7), then the equation of the side AB is

• A. x-y-2=0
• B. x-y+12=0
• C. x+y-12=0
• D. None of these

Answer 1

The correct option is B x-y+12=0

Slope of $DE=\frac{7-3}{5-1}=1\Rightarrow SlopeofAB=1$


Hence equation of AB is $y-7=(x+5)\Rightarrow x-y+12=0$.