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Homework Help: Simultaneous equations

  1. May 26, 2007 #1
    Hi.

    I'm working through a Statistics question and have reached two simultaneous equations that I just can't seem to sove. Could someone please help? I'd really appreciate it.

    The two equations are:

    1.65 - x = -0.5244y

    and

    1.78 - x = 0.8416y


    Thank you.

    Cathy
     
  2. jcsd
  3. May 26, 2007 #2
    Oh, by the way, I have the solutions (x = 1.70 and y = 0.095) but I just don't know the method to obtain them.

    Thank you.

    Cathy
     
  4. May 26, 2007 #3
    1-u can simply make equation one -equation 2

    so x is removed &u'll have equation in y only so u can get Y value



    2-or also,u can get x in terms of y,like 1.65 +0.5244y = x

    then replace x in 2nd equation with this new X

    got it???
     
  5. May 26, 2007 #4
    To find the value of one variable, you need to eliminate the other. Do you know how to do that?
     
  6. May 26, 2007 #5
    Could you please show me as I tried this and did not get the correct answers?

    Thanks for replying.

    Cathy
     
  7. May 26, 2007 #6
    One way of doing it, as mado suggested, would be to subtract one equation from the other.
     
  8. May 26, 2007 #7

    malawi_glenn

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    Can you show us what you did?
     
  9. May 26, 2007 #8
    I've got it now.

    Thanks for your help!
     
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