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Math Help - Equation that is its own inverse

  1. #1
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    Equation that is its own inverse

    Why is Y = -X + B it's own inverse, I can illustrate this graphically but not algebraically. can any one help me with this??
    Thank you
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  2. #2
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    Quote Originally Posted by i_cow044 View Post
    Why is Y = -X + B it's own inverse, I can illustrate this graphically but not algebraically. can any one help me with this??
    Thank you
    functions are inverses if

    (f \circ f)(x)=x so lets try it

    (f \circ f)(x)=f(f(x))=-(-x+b)+b=x-b+b=x

    yay!!!
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