Results 1 to 9 of 9

Math Help - Easy Math Question - Just need to explain it to me.

  1. #1
    Newbie
    Joined
    Dec 2010
    Posts
    11

    Cool Easy Math Question - Just need to explain it to me.

    What strategies can be used to solve and equation algebraically?

    Use 5x - 12 = 4 - 3x and 3/4x + 10 = 7 as an example.


    Please describe each strategy for me, I really don't know how to explain it and my math homework is driving me crazy!!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Jul 2010
    From
    NJ
    Posts
    68
    Step 1: Group variables on one side, constants on the other.

    Step 2: "Normalize" variables (in other words, multiply both sides by a factor such that the coefficient of the variable becomes 1).

    Example: \frac{2}{3}x - 1 = 2

    Step 1: \frac{2}{3}x = 3

    Step 2: \frac{2}{3}x*(\frac{3}{2}) = 3*(\frac{3}{2})

    Answer: x = \frac{9}{2}

    Now try your problems.
    Last edited by elemental; December 3rd 2010 at 07:27 PM. Reason: better example
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    Joined
    Dec 2007
    From
    Ottawa, Canada
    Posts
    3,161
    Thanks
    70
    Well, even if you can't "explain", can you solve each of those ?

    Can you solve this one for x: 2x + 3 = 7
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Dec 2010
    Posts
    11

    Please help with this

    So what would be the answer to 3/4x + 10 = 12

    I don't get hot to solve fractions...Please describe step by step
    Follow Math Help Forum on Facebook and Google+

  5. #5
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1
    Quote Originally Posted by Johnathon324 View Post
    So what would be the answer to 3/4x + 10 = 12

    I don't get hot to solve fractions...Please describe step by step
    You can always multiply through by the LCD of the equation (in this case 4) to clear the fraction

    \dfrac{3}{4}x + 10 = 12 is equivalent to 3x+40=48

    Then continue as normal
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Dec 2010
    Posts
    11
    So lets say I want to check this equation? What should I do? Solve it basically and work backwards? How can I explain than in this essay?
    Follow Math Help Forum on Facebook and Google+

  7. #7
    MHF Contributor
    Joined
    Dec 2007
    From
    Ottawa, Canada
    Posts
    3,161
    Thanks
    70
    Not sure what to tell you; if you're writing an "essay" on solving,
    seems to me you should already know HOW to solve; have you
    not attended math classes?
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Newbie
    Joined
    Dec 2010
    Posts
    11
    I can only show what I do; she said that no numbers or equations should be in the essay. So I have to work around it...
    Follow Math Help Forum on Facebook and Google+

  9. #9
    Newbie
    Joined
    Dec 2010
    Posts
    11
    Quote Originally Posted by Johnathon324 View Post
    I can only show what I do; she said that no numbers or equations should be in the essay. So I have to work around it...
    Never mind I found a way to describe it - Thx though.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Easy problem my book dosn't explain.
    Posted in the Algebra Forum
    Replies: 4
    Last Post: April 21st 2009, 08:01 PM
  2. Replies: 1
    Last Post: October 29th 2008, 05:40 PM
  3. Explain the math behind the secretary problem?
    Posted in the Calculus Forum
    Replies: 4
    Last Post: July 5th 2008, 05:55 AM
  4. help please..easy math
    Posted in the Algebra Forum
    Replies: 5
    Last Post: June 8th 2008, 02:09 AM
  5. Easy Math :P
    Posted in the Math Topics Forum
    Replies: 5
    Last Post: January 5th 2007, 07:49 PM

Search Tags


/mathhelpforum @mathhelpforum