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Math Help - please need help matrix

  1. #1
    Junior Member
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    71

    please need help matrix

    please see the file attachedfor the question
    thanks
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  2. #2
    Member
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    San Diego
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    This matrix is equivalent to this system:

    x + 3z = b
    y = -2
    az = 8

    The first question asks to set a = 2 and b = 3.

    That is, solve:

    x + 3z = 3
    y = -2
    2z = 8

    The third equation tells us that z = 4. Substituting this result into the first equation, we get x + 12 = 3. So x = -9.

    That's all. For part (a), the answer is that x = -9, y = -2, and z = 4.

    Just do exactly the same steps to solve part (b).
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