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Math Help - I need to write this DE

  1. #1
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    I need to write this DE

    I'm not sure how to write the differential equation that correponds to the following statement:

    The rate of change of y with respect to x varies jointly as x and L-y
    I'm not sure what is meant by 'varies jointly' in mathematical terms.
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  2. #2
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    Oct 2009
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    I love Googling

    Got the following from a website:

    "Joint variation means directly, but with two or more variables. An example would be the formula for the area of a triangle with base b and height h: . In words, the area A varies jointly with b and h; the constant of variation is k = 1/2."
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