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Math Help - [SOLVED] Find equation of a plane through three points

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    [SOLVED] Find equation of a plane through three points

    The question is to find the equation of a plane through three points.

    P (1,2,-1)
    Q (2,3,1)
    R (3,-1,2)

    vectors
    PQ (1,1,2)
    RQ (1,-4,1)
    PR (2,-3,3)

    How come PQ and PR are parallel, is RQ parallel as well? I'm following my textbook and it doesn't mention anything about it.

    I can do the work, I'm just curious about RQ.

    Edit: Solved.
    Last edited by thekrown; March 6th 2010 at 05:59 AM.
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