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**Electromagnetics - Method of Images ???**

Hello all, I am in the process of preparing for a entrance examination. In the course of studying I came across this problem that I just can not figure out. Here it is:

A perfectly conducting plane is located in free space at x=4, and a uniform inifinte line charge of 40nC/m lies along the line x=6, y=3 (the intersection of these planes). Let V=0 at the conducting plane. At P(7,-1,5) find (a) V (potential at P); (b) E (electric field at P).

Answer: -316V ; -45.4ax V/m (ax is the unit vector in the x direction)

I have the answers as you can see but I have no idea on how to arrive to them. I have tried for hours. I would appreciate any help or comments.

THank you.