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Math Help - Non square system, system with fewer equations than variations

  1. #1
    Mc3
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    Non square system, system with fewer equations than variations

    -45x+18y+ 21z= -12
    9x+9y+7z=6

    all I have gotten so far is
    -45x+18y+21z= -12
    63y+56z= 18

    i know youre supposed to make z=a but I don't know where to go from here. Please help me out and I need the answers ASAP!
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    Forum Admin topsquark's Avatar
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    Re: Non square system, system with fewer equations than variations

    Quote Originally Posted by Mc3 View Post
    -45x+18y+ 21z= -12
    9x+9y+7z=6

    all I have gotten so far is
    -45x+18y+21z= -12
    63y+56z= 18

    i know youre supposed to make z=a but I don't know where to go from here. Please help me out and I need the answers ASAP!
    You will end up with equations for x, y, and z in terms of one unknown. (You don't have enough equations to get this to single values of x, y, z.) So simply put z = a. Then you have two equations for x and y. Solve them for x and y in terms of a.

    And hey, we get the answers done when someone looks at them, not before. So whereas I know you're in a hurry you are simply going to have to be patient about it and not try to rush us. Please be more polite.

    -Dan
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