Question: How do I solve these problems (1) Is U = {(1, s, t)|s, t E R} a subspace of R3? Support your claim. (2) Is

How do I solve these problems

(1) Is U = {(1, s, t)|s, t E R} a subspace of R3? Support your claim. (2) Is U = {(0, s, t)|s, t E R} a subspace of R3? Support your claim. (3) Determine if x = (2,1,0, 1) lies in U = span{y,z}, where y = (1,0,0,1) and z = (0,1,0,1)

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