Question: Question 3: Explain why the following sets are not subspaces of R (show one of the three properties of subspaces fail) (a) S = y

Question 3: Explain why the following sets are not subspaces of R (show one of the three properties of subspaces fail) (a) S = y : x, y in R ( b ) S = y : ryz - 0, x, y, z in R Question 4: Find the null space of A 1 2 1 -1 2 2 41 1 and write it as a span

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