Results 1 to 6 of 6

Math Help - Gaussian Elimination

  1. #1
    Newbie
    Joined
    Dec 2010
    Posts
    19

    Gaussian Elimination

    Determine the values of s, v and a using:

    (A) Gaussian elimination
    (B) Inverse matrices

    3s + v 2a = -5
    2s 2v + 3a = 22
    s + 3v a = -11

    I may have to change the order, Ive given it ago but get stuck, I know the three methods. And I need to get the bottom left three zero.

    Any help would be great! Thank you
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Newbie
    Joined
    Jan 2011
    Posts
    7
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member
    Joined
    Nov 2010
    From
    Staten Island, NY
    Posts
    451
    Thanks
    2
    Why don't you write out as many steps as you can so we can see what the difficulty is that you're having.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Dec 2010
    Posts
    19
    ok i will do this for you thank you
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Banned
    Joined
    Oct 2009
    Posts
    769

    Partial answer

    Quote Originally Posted by size View Post
    Determine the values of s, v and a using:

    (A) Gaussian elimination
    (B) Inverse matrices

    3s + v 2a = -5
    2s 2v + 3a = 22
    s + 3v a = -11

    I may have to change the order, Ive given it ago but get stuck, I know the three methods. And I need to get the bottom left three zero.

    Any help would be great! Thank you
    The basic idea is to first eliminate one of the variables using two of the equations, then eliminate another variable again using two of the equations, then use the derived equations to finally figure out the value of one of the two remaining values and work backwards to get s, v and a. To get the left corner numbers zero, you can use the first equation to eliminate s from the next two equations, then use the derived second equation to eliminate v from the third equation.

    Does this make sense to you? Can you take it from here? (with respect to inverse matrices, it's been awhile since I've done linear algebra which is where you should have posted your question and I would refer you to your text and class notes).
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Senior Member
    Joined
    Nov 2010
    From
    Staten Island, NY
    Posts
    451
    Thanks
    2
    Quote Originally Posted by wonderboy1953 View Post
    The basic idea is to first eliminate one of the variables using two of the equations, then eliminate another variable again using two of the equations, then use the derived equations to finally figure out the value of one of the two remaining values and work backwards to get s, v and a. To get the left corner numbers zero, you can use the first equation to eliminate s from the next two equations, then use the derived second equation to eliminate v from the third equation.
    You might want to interchange the first and third equation first (or equivalently interchange the first and third row in the augmented matrix). This will simplify the first few computations.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: September 12th 2011, 09:03 PM
  2. [SOLVED] Gaussian elimination help II
    Posted in the Advanced Algebra Forum
    Replies: 2
    Last Post: June 28th 2011, 06:27 PM
  3. Replies: 1
    Last Post: February 16th 2011, 02:06 PM
  4. Replies: 4
    Last Post: November 19th 2009, 05:59 PM
  5. Gaussian Elimination
    Posted in the Calculus Forum
    Replies: 1
    Last Post: June 3rd 2009, 06:06 PM

Search Tags


/mathhelpforum @mathhelpforum