Results 1 to 2 of 2

Math Help - Solving Linear Systems by Elimination

  1. #1
    Newbie
    Joined
    Apr 2011
    Posts
    9

    Solving Linear Systems by Elimination

    5x+6y=23
    4x-6y=-14

    I've tried it:
    5x+6y=23
    -
    4x-6y= -14
    _______________

    x = 37

    Then I did this:

    5(37)+6y=23

    185+6y=23
    -185 -185

    6y=-162
    --- ----
    6 6

    y = -27

    But when I plug those numbers in, it doesn't work. Help please

    P.S.: I am not looking for the answer, but for the way of answering this question. Thank you
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    May 2010
    Posts
    1,027
    Thanks
    28
    you forgot that 6y - (-6y) = 12y. so it would be:

    5x+6y=23
    -
    4x-6y= -14
    ----------------
    x + 12y = 37

    instead, try adding the equations together
    5x+6y=23
    +
    4x-6y= -14
    ---------------
    9x + 0 = 9
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Solving Systems Using Elimination
    Posted in the Algebra Forum
    Replies: 1
    Last Post: February 3rd 2009, 03:52 AM
  2. Solving Systems Using Elimination
    Posted in the Algebra Forum
    Replies: 1
    Last Post: February 2nd 2009, 06:21 PM
  3. Solving Linear Systems by Elimination
    Posted in the Pre-Calculus Forum
    Replies: 11
    Last Post: October 26th 2008, 05:28 PM
  4. Replies: 7
    Last Post: September 19th 2008, 01:26 PM
  5. Replies: 3
    Last Post: October 11th 2006, 09:15 PM

Search Tags


/mathhelpforum @mathhelpforum