Not sure how to do this one, can I get some tips? Thanks.
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Try using If you get 1, then . That means there is no angle between them and they are parallel. is the dot product of u and v. i.e. Parallel.
I think it is much simpler than that, we haven't covered any of that material you mentioned. We've only covered topics to do with vectors. I think it has something to do with scalar multiples maybe?
Here is the criteria: u1 ans u2 are parallel if their co-ordinates are in the same proportion. so u1 and u3 are parallel: -6/-4 = 3/2 = 3/2. so u1 = k x u3 hence parallel. To check if the direction is same check the sign of k
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