a – 4b 2b - a Let W be the set of all vectors of the form with a, b arbitrary reals. Then (mark all that apply): 6a +b -a -b 1 -4 2 is a basis of W. -1 2 -3 3 is a basis of W. -2 -9 3 2 - 4 -2 2 is a basis of W. 12 -2 - 1 I W is not a vector space.

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