(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Find the equation of the surface generated by rotating the line x = 9y about the x-axis.

3. The attempt at a solution

I am not sure how to go about this one... I know that x=9y is a line in the xy plane that crosses through the origin, so rotating it about the x-axis will create a double cone, but I don't know how to find its equation.

And hints would be appreciated

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# Homework Help: Finding the equation of a 3 dimensional surface

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