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Form differential equation

  1. Feb 14, 2016 #1
    1. The problem statement, all variables and given/known data
    i was given dy/dx = -(4x+4y) / (4x+4y-2) , v= x +y . I have tried to do ( as in the photo) , but I didn't get the ans , in the last line of my working , the V and x are not separable , which part of my working is wrong ?

    2. Relevant equations


    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Feb 14, 2016 #2

    phyzguy

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    If v = x+y, then dv/dx = 1 + dy/dx, not x + dy/dx as you wrote.
     
  4. Feb 14, 2016 #3
    i have redone the question , but i gt stucked here , how to proceed?

    btw , the ans given is - ( (x+y) ^2 ) +(x+y ) = x +A
     

    Attached Files:

  5. Feb 14, 2016 #4

    phyzguy

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    Check your signs again.
     
  6. Feb 14, 2016 #5
    ok , i gt it correct now , thanks
     
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