# Thread: Vectors help

1. ## Vectors help

Given that a = 2i + j and b =i + 3j find

a) $\displaystyle \lambda$ if $\displaystyle a + \lambda$b is parrallel to the vector i

b) $\displaystyle \mu$ if $\displaystyle \mu$a + b is parrallel to the vector j

?

2. Originally Posted by Tweety
Given that a = 2i + j and b =i + 3j find

a) $\displaystyle \lambda$ if $\displaystyle a + \lambda$b is parrallel to the vector i

b) $\displaystyle \mu$ if $\displaystyle \mu$a + b is parrallel to the vector j

?
ai+ bj and ci+ dj are parallel if and only if a/b= c/d.

3. Originally Posted by HallsofIvy
ai+ bj and ci+ dj are parallel if and only if a/b= c/d.
I am still not sure how I work out the value of $\displaystyle \lambda$ , how do I get 'rid' of the j component ?