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Homework Statement
See attachment
Homework Equations
The Attempt at a Solution
I'm not sure how to determine which points are co linear or which point lies in between the two. My book doesn't discuss how to do this at all.
but
PQ→ = <1,-1,2>, PR→ = <3,-3,6>
I believe I found these correctly but I'm not sure what to do from here. Thanks for any help anyone can provide.