Results 1 to 3 of 3

Math Help - Driving me nuts !

  1. #1
    Newbie
    Joined
    Sep 2008
    Posts
    14

    Driving me nuts !

    Hi Guys. I don't know if this is the right section but I need some explanation on this (plz?)

    a) Prove that a=b-kc and b=b+ka ( k\neq 1) are collinear (a,b,c have those lines up that represent vectors)

    b) Find \alpha so that vectors a=2i+3j and b= \alphai-j can be collinear.

    I know that these are probably simple but my brain isn't really working well.

    Any help greatly appreciated.

    Rinor
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Sep 2007
    Posts
    66
    b) Find \alpha so that vectors a=2i+3j and b= \alphai-j can be collinear.


    I'm not sure but the condition for 2 vectors of beeing collinear is that the coefficient before i and j must be in proportion.
    So, math]\alpha[/tex] = 2/3

    Hope it's right.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2008
    Posts
    14
    Quote Originally Posted by blertta View Post
    b) Find \alpha so that vectors a=2i+3j and b= \alphai-j can be collinear.


    I'm not sure but the condition for 2 vectors of beeing collinear is that the coefficient before i and j must be in proportion.
    So, math]\alpha[/tex] = 2/3

    Hope it's right.
    Urmmm.... don't really think so. I have read that a=\lambda b, when \lambda\neq 0 then that is the case when a and b are collinear, but I fail to apply that on my drill!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Problem is driving me NUTS
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: October 24th 2009, 07:49 PM
  2. Probability help (this is driving me nuts)
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: September 16th 2009, 11:11 AM
  3. questions driving me nuts!!!
    Posted in the Algebra Forum
    Replies: 1
    Last Post: May 13th 2009, 03:20 AM
  4. Driving me nuts!!! please help
    Posted in the Calculus Forum
    Replies: 2
    Last Post: November 7th 2008, 10:16 AM
  5. Integration is driving me nuts!!!
    Posted in the Calculus Forum
    Replies: 2
    Last Post: April 29th 2008, 02:57 AM

Search Tags


/mathhelpforum @mathhelpforum