yes. It is possible to connect with a single line.

Hi, the best set-up would be a mains power line network with home plugs, I recommend Devolo home plugs.

Watch the video http://www.devolo.com/consumer/dlan-mains-supply-net...

http://www.broadbandbuyer.co.uk/Shop/Reviews.asp?Pro...

You could then use you second router as the wireless access point connected to the power line maims network with a Devolo home plug.

http://www.tested.com/tech/298-how-to-use-an-old-rou...