Even "garbage" would show that you had tried- and we might be able to point out your errors or give hints. As it is we have absolutely no idea what you do understand about this problem and what hints would help you. Do you understand what "echelon form" means? Do you know anything at all about using row operations to put a matrix in echelon form? If so, the arithmetic is straight forward. For example, what do you get if you subtract 2 times the first row from the second row and then subtract 3 times the first row from the third row?