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Math Help - Find symetric equations for the line of intersection of the planes.

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    Find symetric equations for the line of intersection of the planes.

    Find symmetric equations for the line of intersection of the planes.

    5x - 2y - 2z = 1

    4x + y + z = 6

    I interpret this problem to say that I need to find a line of intersection of the two planes. I think I add them together and get 9x -y -z = 7.

    After which, I need to find symmetric equations of that line and I think that is what I am having trouble with. I would like a little background into what a symmetric equation is. The book says that I need to first find a parametric equation then solve for t. Thanks!
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    Quote Originally Posted by jdj333 View Post
    Find symmetric equations for the line of intersection of the planes.

    5x - 2y - 2z = 1

    4x + y + z = 6

    I interpret this problem to say that I need to find a line of intersection of the two planes. I think I add them together and get 9x -y -z = 7. Mr F says: This is not the equation of a line. It's the equation of a plane.

    After which, I need to find symmetric equations of that line and I think that is what I am having trouble with. I would like a little background into what a symmetric equation is. The book says that I need to first find a parametric equation then solve for t. Thanks!
    First get the equations of the line in parametric form by following the reply in this thread: http://www.mathhelpforum.com/math-he...-equation.html
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