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Math Help - How to find the inverse of a function?

  1. #1
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    How to find the inverse of a function?

    i have got this question and am a little confused..can u plz solve...(plz provide all steps)...

    i) I=130+ (0.25).(Y)


    ii) Y=(4).(I) -500
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  2. #2
    MHF Contributor Unknown008's Avatar
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    I(Y) = 130 + 0.25Y

    Make Y the subject of formula and then, 'change' the variables, that is replace I by Y and Y by I^{-1}(Y)

    If that's what you are asking...
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  3. #3
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    4*(I(Y)-130) = Y

    so  I^{-1}(Y)=4*(Y-130)
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  4. #4
    MHF Contributor Unknown008's Avatar
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    Yep.

    Try the other one now.
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