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Question 9 (10 marks) 2 3 2 Given thatA= 2 1 1]. 1 2 1 a) Find detA. (1 mark) b) Find the corresponding cofactor

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Question 9 (10 marks) 2 3 2 Given thatA= 2 1 1]. 1 2 1 a) Find detA. (1 mark) b) Find the corresponding cofactor matrix of A Show your working clearly. (3 marks) c) Hence, find A'l. (1 mark) d) Hence, solve the following system of linear equations using inverse matrix method. x 22 =1 (1) at +3! z =11 (2) 336+ y4z = 14 (3)

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