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Math Help - how does m = b (or slope=y-intercept

  1. #1
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    how does m = b (or slope=y-intercept

    How can I prove that COVAR(x,y)/VAR(x) = b? I'm pretty sure the first part equals m, but I don't see how the slope and y-intercept can be the same thing, unless their both zero.

    Any nudge in the right direction would be greatly appreciated.
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  2. #2
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    My understanding is, for \displaystyle y=a+bx

    then \displaystyle a=\bar{y}-b\bar{x}, b= \frac{cov(x,y)}{var(x)}

    So this works if you call the equation \displaystyle y=mx+c , many text books do.
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  3. #3
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    Thanks, pickslides!
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