John is building a rectangular puppy kennel up against his house using 31 feet of fencing The side against the house does not need a fence and the side paralle

Question

I need to make an equation out of this but don't know how.

Answer 1

Draw and label of diagram.

w represents the width of the pen - there are two

31 - 2w represents the one length of the pen

 

Assuming you want an equation for the area:

A = w(31 - 2w)