SOLUTION: a rectangle has a diagonal of 15 feet and a perimeter of 42 feet. find the rectangle's dimensions

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Question 971498: a rectangle has a diagonal of 15 feet and a perimeter of 42 feet. find the rectangle's dimensions
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
system%28x%5E2%2By%5E2=15%5E2%2C2x%2B2y=42%29

system%28x%5E2%2By%5E2=225%2Cx%2By=21%29

y=21-x

substitute.
x%5E2%2B%2821-x%29%5E2=225
continue to solve for x, and then use it to evaluate y.