Finding s for Parallel Vectors in R3

[75 johnson]

Homework Statement

Let a=(2,2,-1) and let b=(2,-1,s)

The Attempt at a Solution

dividing the i components gives you 1 but then dividing the j components gives you -1/2. I know that the ratio has to be the same for i, j, k in order for the two vectors to be paralle. i need to find s so they are parrallel. am i not seeing something?

 

[tiny-tim]

hi 75 johnson!

what exactly is the question?

 

[75 johnson]

i need to find "s" so that a and b are parallel

 

[tiny-tim]

but a and b are vectors which meet at the origin (0,0,0)