Question: 1 3. a) (3 marks) Compute the 3 by 3 matrices M1, M2, M3 where M1 = 3 1 -1 4], M2 1 [0 -2

1 3. a) (3 marks) Compute the 3 by 3 matrices M1, M2, M3 where M1 = 3 1 -1 4], M2 1 [0 -2 2] and M3 = 0 [0 0 3]. 2 b) (2 marks) Use Gaussian elimination and back substitution to solve Ax = b, where A = M1 + M2 + M3 and b = 5 4

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