# (a) Check that the solutions to Ax = 0 are perpendicular to the rows: [ 1 0 0] [4 2 0 1]

**Chapter 3, Problem 20**

(choose chapter or problem)

(a) Check that the solutions to Ax = 0 are perpendicular to the rows: [ 1 0 0] [4 2 0 1] A = 2 1 0 0 0 1 3 = ER. 3410000 (b) How many independent solutions to AT y = O? Why is y T the last row of E- 1?

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