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Math Help - Find the inverse

  1. #1
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    Find the inverse

    Find the inverse of the following function y = 7-3x

    I got:

    y-7 = -3x
    y-7/3 = x
    -x-7/3 = y

    End.
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  2. #2
    Master Of Puppets
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    You need to divide through by -3

    y = 7-3x swap x and y, then make y the subject

    x = 7-3y

    x - 7= -3y

    \frac{x - 7}{-3}= y

    y=\frac{x - 7}{-3}

    y=\frac{-x }{3}+\frac{ 7}{3}
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