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Math Help - [SOLVED] Graph work help!!

  1. #1
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    Exclamation [SOLVED] Graph work help!!

    hi guys im stuck in a question it says:
    a)draw the graph of y=3x

    b) draw the inverse function on the same grid
    c) write down the equation of the line y=3x and its inverse are symmetrical about.
    ive done a and b but im stuck on c please can someone pleez explain it to me???????????
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  2. #2
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    Quote Originally Posted by help_me View Post
    hi guys im stuck in a question it says:
    a)draw the graph of y=3x

    b) draw the inverse function on the same grid
    c) write down the equation of the line y=3x and its inverse are symmetrical about.
    ive done a and b but im stuck on c please can someone pleez explain it to me???????????
    I know this thread is listed as "solved" but as no answer is given I thought I'd answer it, in case someone else did a search for it.

    Inverse functions are always symmetric about the line y = x. This is required because if we have a point (x, y) of the function y = f(x), then the inverse function must have a point (y, x) corresponding to x = f^{-1}(y).

    -Dan
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