If $\displaystyle (A|b)$ is in reduced row echelon form, prove that $\displaystyle A$ is also in reduced row ehelon form.
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If anyone could explain what $\displaystyle (A|b)$ means, that would be helpful.
This is just an educated guess. In the notation (A|b), I think that A is a matrix such as ‘the matrix of coefficients and b is a column matrix, such as vector of constants.
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