Results 1 to 5 of 5

Math Help - Having trouble solving this equation

  1. #1
    Newbie
    Joined
    Jan 2010
    Posts
    16

    Having trouble solving this equation

    Let's say for example I have;

    7x + 8 = 71 I don't have a problem solving this, I can do it as follows;

    7x + 8 - 8 = 71 - 8

    7x = 63

    7x/7 = 63/7

    x = 9

    The above was done, as you can see by using the addition/subtraction rule and then the division rule.

    However, the follwing equation stumps me;

    45 - 5x = 50

    Can someone enlighten me?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Dec 2009
    From
    1111
    Posts
    872
    Thanks
    3
    Quote Originally Posted by Layman View Post
    Let's say for example I have;

    7x + 8 = 71 I don't have a problem solving this, I can do it as follows;

    7x + 8 - 8 = 71 - 8

    7x = 63

    7x/7 = 63/7

    x = 9

    The above was done, as you can see by using the addition/subtraction rule and then the division rule.

    However, the follwing equation stumps me;

    45 - 5x = 50

    Can someone enlighten me?
    Dear Layman,

    This one is also similar to the above problem. Substract 45 from both sides, then divide both sides by -5.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Sep 2009
    Posts
    66
    45-50=5x
    -5=5x
    therefore, x= -1
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Jan 2010
    Posts
    16
    Thanks.....so is it as follows?

    45 - 5x = 50

    45 - 45 - 5x = 50 - 45
    -5x = 5
    -5x/5 = 5/1
    x = -1
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Super Member
    Joined
    Dec 2009
    Posts
    755
    absolutely right
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Having Trouble Solving Logarithmic Equation
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: October 17th 2011, 03:40 PM
  2. [SOLVED] Exponential Fourier Series - Trouble solving
    Posted in the Differential Geometry Forum
    Replies: 21
    Last Post: September 15th 2010, 06:20 AM
  3. Trouble solving a system of linear congruences.
    Posted in the Number Theory Forum
    Replies: 3
    Last Post: April 14th 2010, 10:10 AM
  4. Replies: 45
    Last Post: August 5th 2009, 10:31 PM
  5. Having Trouble Solving An Algebra Equation
    Posted in the Algebra Forum
    Replies: 22
    Last Post: June 3rd 2007, 03:10 PM

Search Tags


/mathhelpforum @mathhelpforum