Two infinite lines of charge, both parallel to the z-axis, lie in the x−z plane, one with...

Two infinite lines of charge, both parallel to the z-axis, lie in the x−z plane, one with density ρℓ and located at x = a and the other with density −ρℓ and located at x = −a(Fig.). Obtain an expression for the electric potential V(x, y) at a point P = (x, y) relative to the potential at the origin.

Figure P: