(1 point) Given 1 -1 3 -20 3 1 0 0 0 1 0 3 -25 5 2 -1 1 -2 1 -2 16 0 0 1 -4 use the reduced row echelon form above to solve the system = -X – y + 32 -x – 2y + 32 X + y – 2z = -20 -25 = 16 If necessary, parametrize your answer using the free variables of the system. у =