use elementary row operations to reduce the given matrix to (a) row echelon form and (b) reduced row echelon form.
[-2 -4 7
-3 -6 10
1 2 -3]
I will not show the matrices as I get it into REF, because I want you to put some effort into this; but I will give you the row operations that lead to REF. I leave it for you to discover the row operations to get it into RREF from REF.
Can you take it from here?
Remember that in RREF, the leading 1's have zeros above and below them [except if the leading 1 is in the first row, first column--it would only have zeros below it].
I think this is enough of a hint for you to finish this off...
Can you try to take it from here?