Extrapolate a line from a curve

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amberly hadden
amberly hadden on 16 Jun 2014
Commented: José-Luis on 16 Jun 2014
Hi I have plotted a cubic polynomial. Its a curve now I want to plot a starlight line from the portion of curve which is giving straight trend and to extend line until it will hit the y-axis to get the trend. Any idea how would it work.
Thank you
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José-Luis
José-Luis on 16 Jun 2014
Get the derivative at the points you want and intersect it with the x-axis?

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