Mostre que os seguintes subconjuntos de R^4 são subespaços?

(a) W = {(x,y,z,t) E R^4 | x + y = 0 e z - t = 0}

(b) U = {(x,y,z,t) E R^4 | 2x + y - t = 0 e z = 0}

PS.: R^4 = reais elevado a 4

E = pertence a

Atualizada:

ok paulo roberto

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