Results 1 to 7 of 7

Math Help - HELP on solving this equation for Q

  1. #1
    Member
    Joined
    Jan 2009
    From
    Ontario Canada
    Posts
    219

    Smile HELP on solving this equation for Q

    2L/D=(6Q/D)+5
    I have to solve for Q, how do I get rid of the D's at the bottom??
    Lost on this one.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    11,628
    Thanks
    430
    Quote Originally Posted by bradycat View Post
    2L/D=(6Q/D)+5
    I have to solve for Q, how do I get rid of the D's at the bottom??
    multiply every term by D
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Jan 2009
    From
    Ontario Canada
    Posts
    219
    So multiplying D on each side, you get rid of both of them and are left with
    2L=6Q+5??

    See the letters have a value L = 100, Q is 25 and D is 10.
    So if solving for Q so need an answer once multiplied to each other comes to 25.

    Still stuck!!
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    11,628
    Thanks
    430
    Quote Originally Posted by bradycat View Post
    so multiplying d on each side, you get rid of both of them and are left with
    2l=6q+5??
    2l = 6q + 5d
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Member
    Joined
    Jan 2009
    From
    Ontario Canada
    Posts
    219
    Sorry I must be a bit dense on this. Something is not clicking.
    If you divide the first D from the left side.
    You are left with 2L=D(6Q/D)+5
    Is that correct?
    Now if I get rid of the D on the right side. would it not get rid of the D? then there is no D left??Because you have to divide out it all out of the right side.
    I am lost, sorry.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    11,628
    Thanks
    430
    MULTIPLY every term by D , not divide.

    D \cdot \frac{2L}{D} = D \cdot \frac{6Q}{D} + D \cdot 5

    2L = 6Q + 5D

    now solve for Q
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Member
    Joined
    Jan 2009
    From
    Ontario Canada
    Posts
    219
    OH I see it now. I was putting the 6Q+ 5 in brackets and that was wrong???
    Well, I am glad you cleared it up for me, thanks alot Skeeter. Your of great help tonight!!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Help solving this equation..?
    Posted in the Algebra Forum
    Replies: 4
    Last Post: April 2nd 2010, 06:20 PM
  2. solving an equation
    Posted in the Algebra Forum
    Replies: 3
    Last Post: November 14th 2008, 11:50 PM
  3. solving diff equation w/ bournoulli's equation
    Posted in the Calculus Forum
    Replies: 2
    Last Post: February 14th 2008, 06:06 PM
  4. solving equation
    Posted in the Algebra Forum
    Replies: 6
    Last Post: August 2nd 2007, 03:15 AM
  5. Help on solving equation
    Posted in the Algebra Forum
    Replies: 1
    Last Post: July 26th 2007, 04:01 PM

Search Tags


/mathhelpforum @mathhelpforum