Question

Are these vectors parallel or orthogonal or neither? U=(10,0) v=(0,-9)

Answer 1

If u.v = 0, then the vectors are orthogoanl. That's dot product.

Answer 2

I may be wrong, but if you do cross product on the two vectors and it is 0, they are parallel.

Answer 3

Yes, I just looked it up. uxv = 0, the vectors are parallel.