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Math Help - solutions to matrix

  1. #1
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    solutions to matrix

    If the matrix V = [(1, 3, 5), (2, 4, 6), (3, 5, z)]. For what values of z will the system Vx = [9, 10, 11] have

    1. a unique solution?
    2. an infinite number of solutions.
    3. no solutions.

    Show your work please.

    I really can't get this one!
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  2. #2
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    I'd start by calculating the determinant...
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