SOLUTION: The length of a rectangle is twice the width. The perimeter is 84 cm more than the width. Make a diagram and find the rectangles dimension

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Question 864390: The length of a rectangle is twice the width. The perimeter is 84 cm more than the width. Make a diagram and find the rectangles dimension
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x for length
y for width
x=2y, and 2(x+y)=84.
Substitution gives 2%282y%2By%29=84
2%2A3y=84
6y=84
y=84%2F6
highlight%28y=14%29
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highlight%28x=28%29