Ms. Brown has 200m of fencing with which she plans to build a fence( no duh) She intends to construct a rectangular enclosure along a river where no fence is needed. She plans to divide the pen into two smaller pens.
I have the 3 vertical fences labeled as y(there all the same length) and the one horizontal fence labeled as x. Now, I know that x= 200-3y but I can't figure out how to complete the square( I know this involves factoring)