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Math Help - determine equation

  1. #1
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    determine equation

    determine the Cartesian equation of a plane that passes through the points (1,4,5) and (3,2,1) and is perpendicular to the plane 2x-y+z-1=0
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  2. #2
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    How about Ax + By + Cz + D = 0?

    Then 2A - B + C = 0

    Then A + 4B + 5C + D = 0

    Then 3A + 2B + 1C + D = 0

    What else is needed?
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