SOLUTION: Please help me with this vectors question. P.S. I tried entering a,-b in < > but the site wouldn't show that, so I am entering a,-b in ( ) . Question: If v_1= (a, -b) and v_

Algebra ->  Vectors -> SOLUTION: Please help me with this vectors question. P.S. I tried entering a,-b in < > but the site wouldn't show that, so I am entering a,-b in ( ) . Question: If v_1= (a, -b) and v_      Log On


   

Question 980901: Please help me with this vectors question.
P.S. I tried entering a,-b in < > but the site wouldn't show that, so I am entering a,-b in ( ) .
Question:
If v_1= (a, -b) and v_2= <-2a, 2b>, are v_1 and v_2 parallel?
Thank you.
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
v%5B2%5D=-2%2Av%5B1%5D , so they are parallel.
You could calculate the dot product and see that it is zero,
but to me that seems like a less efficient way to answer the question.