6. A system of linear equations is given below: - Ca = 3 - 13 = 2 -21 + x2 + (m + 1)x3 = n (a) Create the augmented matrix [A b]. Row reduce the augmented matrix to row reduced Echelon form so that you can solve Ar = b, where r = [3 marks]. I3 (b) Give the values of m and n that would give the system: i. a unique solution [1 marks] ii. infinitely many solutions [1 marks] iii. no solution [1 marks]