Centerville is the headquarters of Greedy Cablevision Inc. The cable company is about to expand service to two nearby towns, Springfield and Shelbyville. There needs to be cable connecting Centerville to both towns. The idea is to save on the cost of cable by arranging the cable in a Y-shaped configuation.

Centerville is located at

in the

-plane, Springfield is at

, and Shelbyville is at

. The cable runs from Centerville to some point

on the

-axis where it splits into two branches going to Springfield and Shelbyville. Find the location

that will minimize the amount of cable between the 3 towns and compute the amount of cable needed.

Not sure how to start on this one. I know that the distance formula is needed, I'm just not sure how.