Find the equation if the generating curve, y=2x+1 is revolved about the y axis.

How do we do this?

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- Aug 5th 2009, 08:53 PMorendaclEquation of the surface of revolution?
Find the equation if the generating curve, y=2x+1 is revolved about the y axis.

How do we do this? - Aug 6th 2009, 02:46 AMslider142
Focus on a single point (x, 2x + 1). When you revolve this point around the y-axis, it forms a circle. What is the radius of that circle? What coordinate plane is the circle parallel to? Therefore, what is the equation of that circle?