The equations of two equal sides AB and AC of an isosceles triangle ABC are x+y=5 and 7x-y=3 respectively. What will be the equation of the side BC if area of triangle ABC is 5 sq units.
A. x+3y-1=0
B. x-3y+1=0
C. 2x-y=5
D. x+2y=5
Source: Arun Sharma's Quantitative Aptitude for CAT
Solution and explanation pls? I will give the OA after a few discussions