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Math Help - Variation

  1. #1
    Junior Member MoniMini's Avatar
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    Post Variation

    "A varies directly with B when C is constant and inversely with C when B is constant. A=6, B=2 and C=3. What is the value of A when B = 3 and C= 18?"

    What I really don;t know here is how to form the equation/ statement. I've never really come acroos this question.

    Thanks
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: Variation

    The statement "A varies directly with B when C is constant and inversely with C when B is constant" means:

    A=k\cdot\frac{B}{C}

    You may use the given information to find the constant of proportionality k.
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