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!

Homework Help: Form differential equation by substituition

  1. Mar 20, 2016 #1
    1. The problem statement, all variables and given/known data
    dy/dx = (x-y+2) / (x+y-2) , by using x=X and y=Y+2 , form a differential equation .

    2. Relevant equations

    3. The attempt at a solution
    the author gave the answer as (Y^2) +(2XY) -(X^2)+A= 0 , while my answer is (Y^2) +(2XY) -(X^2)+A(X^4)= 0
    is there anything wrong with my answer?
  2. jcsd
  3. Mar 20, 2016 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hint: check how you applied the rule ##\log a - \log b=\log \frac{a}{b}##.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted