8.(a) For A in Exercise 6, part (b) and b=[30,30,20],...... See Below.

8. (a) For A in Exercise 6, part (b) and b = [30, 30, 20], if Ax = b has the given solution x' [10, 10, 0, 0], nd the family of all solutions to Ax = b. (b) Find a solution to Ax = b in part (a) with Jr1 = 5. 6. For the following matrices, describe the set of vectors in the null space. 3 4 l 2 l 5 0 (a) 2 ~1 1 (b) 1 2 4 3 1 l 3 1