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The answers I have chosen are incorrect. Can anyone help? Thanks in advance... enter image description here

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closed as off-topic by 900 sit-ups a day, mookid, Rick Decker, Michael Albanese, rogerl Jul 16 at 0:53

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Explain what you did so you can learn from your mistake, otherwise you may repeat the error again –  Belgi Oct 8 '12 at 16:36

1 Answer 1

Form the matrix of vectors as columns, then get the rank of the resulting matrix. The rank is the dimension of the subspace... and there are standard ways to get the rank if you reduce to row echelon form. Try looking up "rank of a matrix" and "row reduced echelon form" [or is it "column reduced"?].

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