In Exercises 3-4, determine whether b is in the column space of A, and if so, express b as a linear combination of the column vec- tors of A. 3. 1 1 2 a. A = 1 0 1; 2 1 3 1 b. A = 9 1 -1 1 3 1 1; 1 2 b= 5 1 -1

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