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Homework Help: Finding the slope and intercept of a graph

  1. Nov 22, 2009 #1
    1. The problem statement, all variables and given/known data
    I am given the formula A = Bt / (3d2)

    d is what we changed, A is what was measured.

    I had to plot ln(A) vs ln(3d2).

    What do the slope and intercept of this graph represent?

    2. Relevant equations

    3. The attempt at a solution
    ln (A) = ln (Bt / 3d2) = ln(Bt) - ln(3d2)

    ln (A) / ln (3d2) = ln (Bt)/ln(3d2) - 1

    After this I get stuck. Help please!
  2. jcsd
  3. Nov 22, 2009 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    If you are plotting ln(A) vs. ln(3d2), then let

    x = ln(3d2)
    y = ln(A)​

    and you are now plotting y vs. x.

    Write your equation,

    ln (A) = ln(Bt) - ln(3d2),​

    in terms of x and y. The slope and intercept should become easier to identify.
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