i need help quickly please!

[ahmadazar]

if i have 2 variables for example X and Y . X is function of y. when X increases, y increases. how can i make a loop between these two variavles. i tried to make this in vensim but i received the mesage of "model error simultaneous equations".

i made the following steps to do that but i failed:
i wrote the equation of X as a function of y.
i make a lookup table from X to Y .

but also the model wrotes an error of simultaneous equation

[bob@vensim.com]

Feedback loops have to pass through a level - I recommend working through Chapter 5 of the Vensim User's Guide.