Thread Subject: How to solve simultanious equations without inverse function in Simulink?

I would like to know how to construct Simulink model without inverse function.
We have two functions of y=f1(x),y=f2(x) and we want to get x and y
for f1(x)=f2(x)=y.
Making loop with y=f1(x) and x=Inverse(f2(y)) can get solutions x and y for the problem. But we need inverse function for at least one function.
Please let me know the Simulink modeling technique without inverse function.