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1. For the linear system 2x + y + z = 1 x + 2y + z = 2 x + y + 2z

1. For the linear system 2x + y + z = 1 x + 2y + z = 2 x + y + 2z = 3 , answer the followings: (a) Find matrices A, x and b that express the above linear system as a matrix equation. (b) Find A- and express it as a product of elementary matrices. (c) Solve the system by multiplying A- and b.

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