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Math Help - Quadric Surface Problem

  1. #1
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    Quadric Surface Problem

    Let L be the line y=10, x=9z. If we rotate L around the x-axis, we get a surface whose equation is Ax^2+By^2+Cz^2 = 1, where
    A = , B = , C =

    I'm was able to find B and C. Need help with A.
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  2. #2
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    Quote Originally Posted by viet View Post
    Let L be the line y=10, x=9z. If we rotate L around the x-axis, we get a surface whose equation is Ax^2+By^2+Cz^2 = 1, where
    A = , B = , C =

    I'm was able to find B and C. Need help with A.
    The point (9,10,1) lies on L and therefore on the surface. That gives you a relation that will determine A.
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  3. #3
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    so to solve A, i set y & z to 0, and solve for A right?
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