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Linear algebra question

  1. Nov 3, 2004 #1
    Let P=(9,-7,-1) and Q=(-5,-5,-5). The set of all points that are equidistant from P and Q are given by the equation __x + __y + __z + __ = 0.

    ^^The question!

    All I want to know is how to start this question. I thought I was supposed to find the equation of the normal to the center of PQ but that didnt work out. Thanks!
  2. jcsd
  3. Nov 3, 2004 #2

    Tom Mattson

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    You need to set up the distance formula twice. Once for the distance between point P and the point (x,y,z) and once for the distance between point Q and the point (x,y,z). And since (x,y,z) is equidistant from P and Q, you do..........what?
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