SOLUTION: Please help with this, my exam is tomorrow. Thanks A picture frame has the perimeter of 40 inches. If the width is 4 inches shorter than the length, what are the length and widt

Question 752953: Please help with this, my exam is tomorrow. Thanks
A picture frame has the perimeter of 40 inches. If the width is 4 inches shorter than the length, what are the length and width?
I set it up like this but its not making any sense to me. 2(2w)-2l=40 my answer key says L=12 and W=8
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
The formula for the perimeter is

You are given that
and in
----------------
By substitution:

and, since

The length is 12 in and
the width is 8 in

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