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Math Help - finding Vo and r from a straight line graph

  1. #1
    Newbie
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    May 2009
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    finding Vo and r from a straight line graph

    I have this question:



    I've got my straight line by taking logs of V and plotting it in excel giving me this:



    though I have no idea how to find r and Vo using it. I think the linear equation should be ln(V) = ln(Vo)+-r though might be wrong?
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  2. #2
    MHF Contributor
    Joined
    Mar 2007
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    Talking

    By taking logs, V = e^(-rt) can become f(t) = ln(V) = -rt. This is why the graph they gave you is labelled with "t" on the x-axis at "ln(V)" on the y-axis.

    If ln(V) = -rt, then you must have V = e^(-rt). (Use what you've learned about logs to show this.)

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