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Math Help - Equation of the surface of revolution?

  1. #1
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    Equation 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?
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  2. #2
    Junior Member slider142's Avatar
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    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?
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