SOLUTION: : The width of a rectangle is 5cm less than its length. If its perimeter is 38cm, find its width..

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Question 665984: : The width of a rectangle is 5cm less than its length. If its perimeter is 38cm, find its width..

Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
Given
w = l-5; rearrange as l = w+5
p = 38
...
Knowing
p = 2l + 2w
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Substitute into the perimeter equation and solve for w
2(w+5) + 2w = 38
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Distribute the 2
2w + 10 + 2w = 38
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Combine like terms
4w = 38 - 10
4w = 28
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Divide both sides by 4
highlight%28w+=+7%29
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