SOLUTION: If the perimeter of a rectangle is 18ft and the width is 5ft, find its length.

Question 75657: If the perimeter of a rectangle is 18ft and the width is 5ft, find its length.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
The perimeter of a rectangle is the width+length+width+length. Since the 2 width's are the same we can say w+w=2w. The same thing applies for the length: L+L=2L. So the perimeter formula can be written as:
where P is the perimeter
Now plug in the given perimeter and the width to find the length

Subtract 10 from both sides

Divide both sides by 2

So the length is 4 feet

Check:

works

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