Question: Let V be the vector space R. (a) Let W = {(x, y, z) = R : z = x + y}. Is W

Let V be the vector space R. (a) Let W = {(x, y, z) = R : z = x + y}. Is W a subspace of V? Give reasons. == (b) Let U = {(x, y, z) = R z = x} Is U a subspace of V? Give reasons.

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