Which of the following is a solution to the differential equation:
ylny + xy' = 0 for x > 0 ?
A. xlny = 1 B. xylny = 1 C. (lny)2 = 2
D. -y(lny)(lnx) = 1 E. lny + (x2/2)y = 1
The answer is A.
A. xlny=1, then (xlny)'=0, then lny+(x/y)y'=0. We multiply y on both sides and get
A Differential Equation is solved. The solution is detailed and well presented. The response was given a rating of "5" by the student who originally posted the question.