Here's the question you clicked on:
jldavis76
Determine whether the indicated subset is a subspace of the given Euclidean space R^n - {[x,y,z]}|x,y members of R and z=3x+2} in R^3?
[0,0,0] is not in the set, so it can't be a subspace.
Well, that was quite simple actually...I forgot to even look at that..thanks!