# Math Help - Reduced Row Echelon Prove

1. ## Reduced Row Echelon Prove

If $(A|b)$ is in reduced row echelon form, prove that $A$ is also in reduced row ehelon form.

2. If anyone could explain what $(A|b)$ means, that would be helpful.

3. 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.