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Thread: 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 $\displaystyle -3$

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

    $\displaystyle x = 7-3y$

    $\displaystyle x - 7= -3y$

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

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

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