Given A and b in Exercises 11 and 12, write the augmented matrix for the linear system that corresponds to the matrix equation Ax = b. Then solve the system and write the solution as a vector. 11. A = 12. A = 1 2 4 0 1 -2 -4 -3 1 2 -3 -1 05 5 , b = -2 2 , b: 3 2 9 -[ [4]

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