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Math Help - Direct variation

  1. #1
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    Exclamation Direct variation

    y varies directly as (x+5) and f(2)=3. Set up the Equation
    Last edited by tupac; January 6th 2009 at 06:15 PM.
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  2. #2
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    y varies directly as (x+5)
    translates to the equation y = k(x+5) , where k is the constant of proportionality

    use f(2) = 3 to find k ...

    3 = k(2+5)

    k = \frac{3}{7}

    so, the function is y = \frac{3}{7}(x+5)
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