Question: True or false? If true, give a concise explanation; if false, give a counterexample. (a)The span of the rows of a matrix A is the

True or false? If true, give a concise explanation; if false, give a counterexample.

(a)The span of the rows of a matrix A is the same subspace as the span of the rows of rref(A).

(b)If vectors u,v,x and y are vectors in R4 such that u = 2v + 0x 3y, then a basis for span(u,v,x,y) is (u,v,y)

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