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Math Help - Calculating intercept and gradient

  1. #1
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    Calculating intercept and gradient

    Hey, I am going through an exam paper and can't work out how to do this question, can someone show me how to work it out please

    Given that y= 4x^3
    a)What is the value of the intercept on the Y axis obtained by plotting log (y) against log (x)
    b) What is the gradient obtained by plottin log(y) against log(x)

    Thankyou ^^
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  2. #2
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    y = 4x^3

    log(y) = log(4) + 3*log(x)

    You should recognize this as the Slope-Intercept form of a line.

    y = m*x + b

    m = Slope = Gradient = 3

    b = Intercept = log(4)
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  3. #3
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    Thats quite easy, thankyou
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