Problem: The matrix 1 0 2 -1 1 2 1 3 3-10-2 0 1 -1 1 01 5 1 9 -112 has the reduced row echelon form 1 0 2 0-3 0 0 1-1 0 2 0 ã¼10001-20 0 0 0 0 0 1 (This is of course easy enough to check, but you are not required to do so.) Use this information to solve the following linear systems without further computations 23-1 5r1+r2+93 -11