Need help finding a tutorial or video (M1 vectors with parallel lines) Watch

makin
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Hi there .

I am struggling on the below question as I don't understand how the answer comes up with (-ki + 4kj) part.

I've tried typing a few things in Google and not find anything that goes through these type of questions. My text book doesn't mention this anywhere either and I have been working through this from the start.

Can someone point me to somewhere where I can learn what is going on please as I want to fully understand it?

Thanks
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jojo55
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(Original post by makin)
Hi there .

I am struggling on the below question as I don't understand how the answer comes up with (-ki + 4kj) part.

I've tried typing a few things in Google and not find anything that goes through these type of questions. My text book doesn't mention this anywhere either and I have been working through this from the start.

Can someone point me to somewhere where I can learn what is going on please as I want to fully understand it?

Thanks
Try drawing the -i + 4j first and draw the diagonal line joining them.

Can you see that k is now being multiplied to both of them? This will make the diagonal line still have the same gradient. Draw a few example with different values of k and you will see what I mean.

Hope that helped.
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tomahawker314
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The K part is called a scalar. It is a constant multipled to each part of the vector. It stretches it without changing its direction, keeping it parallel. You're job is to find the vector b that when added to vector a produces some multiple of (-1i+4j).
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djdanny22
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Have you seen the video tutorials on examsolutions? They're pretty handy!
https://www.examsolutions.net/a-leve...rials/#vectors
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RuthieG101
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Jack brown in YouTube has the full course playlist, you a may find it on there.
I'm doing pure, so no idea about mechanics
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