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state whether each of the following matrices is in reduced echelon form. If it is not, then give a reason and say what single row operation is needed to bring it to reduced echelon form.

II)

1 1 0 3 0

0 0 1 2 0

0 0 1 2 1

not in reduced echelon form ( don't know how to do this one)

NOT SURE WHAT SINGLE OPERATION will bring to reduced echelon form

III)

1 0 -2 0

0 1 0 0

0 0 0 1

not in reduced echelon form(not sure how to remove the -2)

NOT SURE WHAT SINGLE OPERATION will bring to reduced echelon form

0 1 5 0 1

0 0 0 1 2

0 0 0 0 0

not in reduced echelon form (there is a 5 in the way)

NOT SURE WHAT SINGLE OPERATION will bring to reduced echelon form

VII)

1 4 0 1

0 0 0 0

0 0 1 3

not in reduced echelon form(there is a 4 in the way)

NOT SURE WHAT SINGLE OPERATION will bring to reduced echelon form