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Math Help - Gaussian Elimination 3 by 3 Matrix

  1. #1
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    Post Gaussian Elimination 3 by 3 Matrix

    2x + 7y + 3z = 1
    4y + bz = (a^2)
    8y + az = 3b + 1

    Where a and b are unknown. Find a and b.

    I'm stuck after few step and i cant solve this question. After 2 times row 2 minus row 3.
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  2. #2
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    Quote Originally Posted by wkn0524 View Post
    2x + 7y + 3z = 1
    4y + bz = (a^2)
    8y + az = 3b + 1

    Where a and b are unknown. Find a and b.

    I'm stuck after few step and i cant solve this question. After 2 times row 2 minus row 3.
    This makes no sense at all- there is no reason why a and b cannot be any numbers. Is it possible that the question asks for values of a and b so that there is not a unique solution to this system?
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  3. #3
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    Quote Originally Posted by HallsofIvy View Post
    This makes no sense at all- there is no reason why a and b cannot be any numbers. Is it possible that the question asks for values of a and b so that there is not a unique solution to this system?
    That why i cant solve for this question, im heard from my friend and he said that row 3 can be assume as 0. But he doesnt know to do so.
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