Calc 3

Find parametric equations for the tangent line to the curve of intersection of the paraboloid
z = x2 + y2
and the ellipsoid
6x2 + 5y2 + 7z2 = 39
at the point
(−1, 1, 2)

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asked by Becky
  1. if u and v are functions of x,y,z, then the normals are

    Nu = ∇u
    Nv = ∇v

    The tangent line of the intersection is perpendicular to both normals

    T(x,y,z) = ∇u × ∇v

    ∇u = 2xi + 2yj - k
    ∇v = 12xi + 10yj + 14zk

    T(-1,1,2) = 33i + 34j + 2k
    so that would be

    x = -1 + 33t
    y = 1 + 34t
    z = 2 + 2t

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    posted by Steve
  2. can you please explain to me where you got the numbers for T(-1,1,2) I know you did the cross product but I can not seem to get the same numbers as you. Please explain

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    posted by Becky

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