Results 1 to 2 of 2

Math Help - fractions solve by substitution

  1. #1
    Newbie
    Joined
    Aug 2010
    Posts
    14

    fractions solve by substitution

    x/2-y/3=5/6
    x/5-y/4=29/10
    Follow Math Help Forum on Facebook and Google+

  2. #2
    A riddle wrapped in an enigma
    masters's Avatar
    Joined
    Jan 2008
    From
    Big Stone Gap, Virginia
    Posts
    2,551
    Thanks
    12
    Awards
    1
    Quote Originally Posted by mafai44 View Post
    x/2-y/3=5/6
    x/5-y/4=29/10
    Hi mafai44,

    [1]\:\: \frac{x}{2}-\frac{y}{3}=\frac{5}{6}

    [2]\:\: \frac{x}{5}-\frac{y}{4}=\frac{29}{10}

    Multiply [1] by 6 and multiply [2] by 20

    [3]\:\: 3x-2y=5

    [4]\:\: 4x-5y=58

    Multiply [3] by 5 and multiply [4] by -2

    [5]\:\: 15x-10y=25

    [6]\:\: -8x+10y=-116

    Add [5] + [6]

    7x=-91

    \boxed{x=-13}

    Using [3]

    [3]\:\: 3(-13)-2y=5

    -39-2y=5

    -2y=44

    \boxed{y=-22}



    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. solve by substitution
    Posted in the Algebra Forum
    Replies: 7
    Last Post: August 12th 2010, 03:09 PM
  2. Using substitution to solve
    Posted in the Algebra Forum
    Replies: 1
    Last Post: June 10th 2009, 09:46 PM
  3. Replies: 1
    Last Post: February 5th 2008, 11:58 PM
  4. Solve by substitution
    Posted in the Algebra Forum
    Replies: 1
    Last Post: July 29th 2005, 05:34 PM
  5. solve by substitution
    Posted in the Algebra Forum
    Replies: 1
    Last Post: July 17th 2005, 11:29 PM

Search Tags


/mathhelpforum @mathhelpforum