1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

How do I find the meaning of x in: 0,3x-6-x=-4,6 ? ;/

  1. Sep 6, 2011 #1
    How do I find the meaning of x in: 0,3x-6-x=-4,6 ? ;/
     
    Last edited: Sep 6, 2011
  2. jcsd
  3. Sep 6, 2011 #2

    eumyang

    User Avatar
    Homework Helper

    Re: 0,3x-6-x=-4,9

    Do you know how to solve linear equations?
     
  4. Sep 6, 2011 #3
    Re: 0,3x-6-x=-4,9

    0,3x-6-x=-4,6|+6
    0,3x-x=1,4
    -0,3x=1,4|:0,3
    x=4,(6)

    And I am lost now ;/ That number isn't right
     
  5. Sep 6, 2011 #4

    eumyang

    User Avatar
    Homework Helper

    Re: 0,3x-6-x=-4,9

    This isn't right. 0,3x - x does not equal -0,3x. It may be easier to think of it as;
    0,3x - 1x
    (a variable without a coefficient really means that the coefficient is 1)
    So what does this equal to?
     
  6. Sep 6, 2011 #5
    Re: 0,3x-6-x=-4,9

    -0,7x=1,4|:0,7
    x=2

    0,3*2-6-2=0,6-8=-7,4

    But then we get the wrong answer.
     
  7. Sep 6, 2011 #6

    eumyang

    User Avatar
    Homework Helper

    Re: 0,3x-6-x=-4,9

    No... :cry: the bold should be -0.7, not 0.7.

    No... :cry: :cry: you need to follow the order of operations! Ignoring that we have the wrong answer for the moment, the multiplication comes first, then the 1st subtraction, and then the 2nd subtraction. You multiplied, and then did -6-2, which is wrong.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: How do I find the meaning of x in: 0,3x-6-x=-4,6 ? ;/
  1. Expressing cos^6(x)? (Replies: 1)

Loading...