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Homework Help: How I can solve this two equations ?

  1. May 28, 2012 #1
    Hi all ..

    How I can solve this two equations to get a and w0 ... ?
    12 .5 = W0 + 10a ====== 1
    20 = 10W0 + 5a ======= 2

    --------------
    this my trying ...
    first I will multiply first equation with (-10) to remove the W0 then I will add both ..
    -125 = -10W0 - 100 a
    20 = 10W0 + 5a
    --------------
    -105 = -95 a
    a = 1.1

    is that correct ... ?
     
  2. jcsd
  3. May 28, 2012 #2
    Either you can isolate a in one of them and insert a in the other to isolate W0.
    Or you could substract 2 times the equation below from the above yielding:
    [itex] 12.5-40 = W_0 - 20W_0 +10a -10a [/itex]
    Then a should be easy(insert W0)
     
  4. May 28, 2012 #3
    Correct. Called Gaussian Elimination.
     
    Last edited: May 28, 2012
  5. May 28, 2012 #4
    thanks so much ..
     
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