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(1, 2, 3) and (3, 6, 9) from what I read I understand that the second vector is just a multiple of 3 of the first vector and so the answer would be a line.

(1, 0, 0)and (0, 2, 3) although the back of the book has the answer I have no idea how to even approach this work. I'm not sure my professor is really explaining much of anything and expects everyone to know exactly what he is talking about.

(2, 0, 0) and (0, 2, 2) and (2, 2, 3)

If someone could please explain to me a good way to approach learning a new subject within mathematics I would greatly appreciate it.

V/R

Christina