# [✓] Indicate to W|A that variables are dependent, rather than independent?

GROUPS:
 I have seen that the Mathematica product can do this, but I've yet to figure out how to indicate to W|A that variables are dependent, rather than independent. I know that the product can do this, because equations such as finding d/dx of $$xe^x=ye^x$$ produce correct answers ... following along in the solutions. But if I take this result, properly reduced, d/dx of $$\frac{y(x-1)}{x(y-1)}$$ it assumes that the variables are independent. I've tried all sorts of notation without finding a method to instruct to W|A that x and y are dependent variables. Thank you for any answers to my question. BTW I am a paying member of W|A. :-)
2 months ago
5 Replies
 Bill Simpson 2 Votes Can you use this Dt[y(x-1)/(x(y-1)),x] to help you get closer to where you want to go?WA link
2 months ago
 Yes, thank you! Strange that I could not find this under the PD examples or similar. But that did exactly work for me! I've been wrestling about this subject for quite a while. :-) Is there a website area where this syntax is explained?