Consider the following two subsets of vector space V2(R)
S1 = {(x1, x2)} | x1 + x2 ≥ 0
S2 = {(x1, x2)} | x12 + x22 ≤ 1
1
S1 be a subspace of V2(R) but not S2
2
S2 be a subspace of V2(R) but not S1
3
Both S1 & S2 be a subspace of V2(R)
4
Neither S1 nor S2 in a subspace of V2(R)