SOLUTION: the area of the rectangle varies jointly with its length and width. The area of the rectangle is 50cm^2 when its length measures 5 and width of 10. Find the area of the rectangle i

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Question 1104650: the area of the rectangle varies jointly with its length and width. The area of the rectangle is 50cm^2 when its length measures 5 and width of 10. Find the area of the rectangle if its width meausre 12cm and length of 8cm. Joint variation?
Answer by josgarithmetic(39838) About Me  (Show Source):
You can put this solution on YOUR website!
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the area of the rectangle varies jointly with its length and width.
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L for length and w for width.
You already know that for area A of a rectangle, A=wL. If you are reading the variation language then you might believe you need a variation constant, k, and say A=kwL, but you should not need it, since it is 1.


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The area of the rectangle is 50cm^2 when its length measures 5 and width of 10.
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50=10%2A5

You know all that you need.