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Math Help - Graphing a log

  1. #1
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    Graphing a log

    Hi all,
    just a quick question about logs and graphs. I have a graph of two variables log of f and and log of R with logR being on the x axis. The graph forms a straight line with an equation of the form y=mc+c. There is a relationship between f and R of the form f=KR^a. How would one go aboout finding the values of K and a from the graph. Any pointers would be greatly appreciated.

    Thanks
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  2. #2
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    Quote Originally Posted by daragh8008 View Post
    Hi all,
    just a quick question about logs and graphs. I have a graph of two variables log of f and and log of R with logR being on the x axis. The graph forms a straight line with an equation of the form y=mc+c. There is a relationship between f and R of the form f=KR^a. How would one go aboout finding the values of K and a from the graph. Any pointers would be greatly appreciated.

    Thanks
    I take it you are graphing log(R) vs. log(f), then? Well, if the relationship between the two variables is
    f = KR^a

    log(f) = log(KR^a)

    log(f) = log(R^a) + log(K)

    log(f) = a \cdot log(R) + log(K)

    This is in the form of a line (y = mx + b), where the slope is a and the intercept is log(K).

    -Dan
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    Many thanks. Might stand a chance of finding the solution now

    Thanks again
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