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Math Help - Matrices and confusion! :/

  1. #1
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    Matrices and confusion! :/

    Solve x + 10y 2z = 20
    5x 3y + 4z = 82x + y = 6

    (20, 8, 6)
    (4, -2, 5)
    (2, 2, 1)
    (2, 4, -1)



    Please help me with the above problem
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  2. #2
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    Re: Matrices and confusion! :/

    Sorry, it didn't paste right.
    Here is the correct problem:
    x + 10y 2z = 20
    5x 3y + 4z = 8
    2x + y = 6
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  3. #3
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    Re: Matrices and confusion! :/

    Quote Originally Posted by dzomberg View Post
    Sorry, it didn't paste right.
    Here is the correct problem:
    x + 10y 2z = 20
    5x 3y + 4z = 8
    2x + y = 6
    Can you use an inverse matrix to solve
    \left[ {\begin{array}{rrr}1&{10}&{ - 2}\\5&{ - 3}&4\\2&1&0\end{array}} \right]\left[ {\begin{array}{*{20}{c}}x\\y\\z\end{array}} \right] = \left[ {\begin{array}{*{20}{c}}{20}\\8\\6\end{array}} \right]
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