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Math Help - Planes

  1. #1
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    Planes

    A plane P passes trough the points (1,1,1) and (2,0,3)

    And it is perpendicular to the plane Q

    x+2y-3z=0

    What is the equation for plane P?

    Please help!
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  2. #2
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    Quote Originally Posted by techmath View Post
    A plane P passes trough the points (1,1,1) and (2,0,3)
    And it is perpendicular to the plane Q x+2y-3z=0
    <1,-1,2> is the vector determined by the two points.

    So the normal to the needed plane is cross product <1,-1,2>\times <1,2,-3>.
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