If x−2y+4=0  and 2x+y−5=0  are the sides of a isosceles triangle having area 10 sq. units. Equation of third side is :

Equation of third side can be 2x+y±(x−2y)=k  and area of Δ=10sq ∴  Distance from (615,135) to third side is 10 ∴  Equation of third side is x+3y=19  or  x+3y+1=0  or  3x−y+9=0  or  3x−y=11