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I am struggling with this question...

U is a set of all matrices of order 3X3, in which there is

__at least__one row of 0's.

W is the set of matrices:

a b

c b+c-3a

where a,b,c are real numbers.

V is the set of vectors: (x,y,z,w), for which 5(y-1)=z-5

which

__two__of these statements are correct ?

a. U is a vector subspace with dimension of 9

b. U is a vector subspace with dimension of 6

c. W is a vector subspace with dimension of 2

d. W is a vector subspace with dimension of 3

e. V is a vector subspace with dimension of 3

f. V is a vector subspace with dimension of 2

g. V and U are not sub-spaces

I think that U should be, but I don't know, the 0's confuse me, and I don't know about W and V.

thank you...