Linear Algebra Doubts

Posted by The Villain on Jun 15, 2014; 7:58am
URL: http://discussion-forum.276.s1.nabble.com/Linear-Algebra-Doubts-tp7592776.html

Which one of these are subspaces over R3..?

1.Let W-{(a1,a2,1 :a1,a2 belongs to R}

2.Let W={a(1,1,1) : a belongs to R}={(a,a,a) :a belongs to R}

3..Let W-{(a1,a2) :a1+a2=1,a1,a2 belongs to R}.Is it a subspace over R2.


Please explain the answers .Thanks