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Math Help - Math Final tomorrow

  1. #1
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    Question Math Final tomorrow

    If y varies inversely as x and x=50 when y=2.7, find y when x=80(round the answer to the nearest tenth)

    possible answers: 3.4, 0.2, 4.3 1.7
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  2. #2
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    Quote Originally Posted by lional View Post
    If y varies inversely as x and x=50 when y=2.7, find y when x=80(round the answer to the nearest tenth)

    possible answers: 3.4, 0.2, 4.3 1.7

    y varies inversely as x means:

    y=\frac{k}{x} where k is called the constant of proportionality.

    Use your first bits of info to calculate k:

    2.7=\frac{k}{50}

    k=135

    Now on to your second set of info to find y when x=80.:

    y=\frac{135}{80}

    y=1.6875\approx{1.7}
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