which of the following matrixes are in row-reduced echelon form. ?

Anonymous2021-04-09T00:12:36Z

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?2021-04-07T15:09:42Z

Reduced row echelon form has four requirements:

1) The first non-zero number in each row (the leading entry) is the number 1.
2) For every subsequent row, the number 1 must be further to the right.
3) The leading entry in each row must be the only non-zero number in its column.
4) All zero rows are placed at the bottom of the matrix.

The fourth matrix is in reduced row echelon form.

The first matrix violates the 3rd requirement
The second matrix violates the 3rd and 4th requirement
The third matrix violates the 1st requirement
The fifth matrix violates the 2nd and 3rd requirement