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Thread: Help with finding an equation of a graph..

  1. August 14th 2007, 11:47 PM #1
    konnie
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    Help with finding an equation of a graph..

    A curve is traced by a point P(x,y) which moves such that its distance from the point A(-1,1) is three times its distance from the point B(2,-1). Determine the equation of the curve.

    I have no idea where to start. Please help
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  2. August 15th 2007, 03:17 AM #2
    Plato
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    This is the distance from P to A: D(P,A) = \sqrt {\left( {x + 1} \right)^2 + \left( {y - 1} \right)^2 }.

    Now you want to write the equation resulting from D(P,A) = 3D(P,B).
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