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Math Help - Algebraic Fractions

  1. #1
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    Algebraic Fractions

    R = -0.0075t+3.85. Solve for t.

    Here's my working.

    R = -0.0075t+3.85
    R-3.85 = -0.0075t
    -t = R-3.85/-0.0075
    t = R-3.85/0.0075

    I thought this was correct but in the answer book on the very last step, I am wrong:

    t = 3.85-R/0.0075

    Why is this?
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  2. #2
    MHF Contributor Also sprach Zarathustra's Avatar
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    Re: Algebraic Fractions

    Quote Originally Posted by JanoD View Post
    R = -0.0075t+3.85. Solve for t.

    Here's my working.

    R = -0.0075t+3.85
    R-3.85 = -0.0075t
    -t = R-3.85/-0.0075
    t = R-3.85/0.0075


    I thought this was correct but in the answer book on the very last step, I am wrong:

    t = 3.85-R/0.0075

    Why is this?



    R = -0.0075t+3.85

    R - 3.85 = -0.0075t

    Dividing by:  -0.0075


    \frac{R - 3.85}{-0.0075}=t
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  3. #3
    MHF Contributor

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    Re: Algebraic Fractions

    Quote Originally Posted by JanoD View Post
    R = -0.0075t+3.85. Solve for t.

    Here's my working.

    R = -0.0075t+3.85
    R-3.85 = -0.0075t
    -t = R-3.85/-0.0075
    Here is your error. You divided both sides by -0.0075 and \frac{-0.0075t}{-0.0075}= t, not -t.

    t = R-3.85/0.0075

    I thought this was correct but in the answer book on the very last step, I am wrong:

    t = 3.85-R/0.0075

    Why is this?
    Follow Math Help Forum on Facebook and Google+

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