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# Quick C4 vector question watch

1. If you have the vector equation of a line that is;
i + 2j + k + a[2i – 6k]

Then is it correct to write it as this (i.e. "simplify" the direction vector)?;
i + 2j + k + a[i – 3k]

I'm pretty sure it is but just thought I'd quickly check
2. Yup.
3. (Original post by n_251)
If you have the vector equation of a line that is;
i + 2j + k + a[2i – 6k]

Then is it correct to write it as this (i.e. "simplify" the direction vector)?;
i + 2j + k + a[i – 3k]

I'm pretty sure it is but just thought I'd quickly check
Yes I think so BUT I would use a different constant, if you used alpha then why not use beta.( saves on confusion)
4. Yeah, what steve2005 said, It's okay but it could mess things up later if you are trying to find a point or something, so change the constant.
5. (Original post by steve2005)
Yes I think so BUT I would use a different constant, if you used alpha then why not use beta.( saves on confusion)
But isn't the symbol in front of the direction vector a variable though?

It can take different values can't it?

But, I see what you're saying and yup a different symbol makes sense too

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Updated: January 24, 2010
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