Vectors question please help Watch

allenpc
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Stuck on part two. Answer is -5i - j.
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TurboZX453
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So let R be an arbitrary vector xi+yj. So then using the vectors P and Q work out the magnitude of the vectors. Then, set P to R equal to 2/3. and R to Q to 1/3. Two simultaneous equations and Voila!
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allenpc
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(Original post by TurboZX453)
So let R be an arbitrary vector xi+yj. So then using the vectors P and Q work out the magnitude of the vectors. Then, set P to R equal to 2/3. and R to Q to 1/3. Two simultaneous equations and Voila!
Thanks so much, now I get it!
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TurboZX453
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(Original post by allenpc)
Thanks so much, now I get it!
Im surprised I got it myself!
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