# Vector tutorial suggestion

#### trojsi

Hi I have this problem (attached) and I really need some brush up on vectors. Can you suggest a link for some good notes or tutorials that tackles part b) and c) .

thanks

Brandon

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#### running-gag

Hi

2 lines are perpendicular if their direction vector are perpendicular (dot product equal to 0)

2 lines intersect if you can find one value for $$\displaystyle \lambda$$ and one for $$\displaystyle \mu$$ such that the coordinates are equal

l1 and l2 intersect and are perpendicular ; in the plane formed by l1 and l2 place A, P and B

trojsi