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?