Know the 2-variables function $F(x,y)$. How can I define the function $x\to f(x)$ s.t. $F(x,f(x))=0$?

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    $\begingroup$ So you want to solve an equation, right? Did you search for how to solve equations in Mathematica? Please show what you have already tried, and we can go from there. $\endgroup$ – Szabolcs Aug 8 '19 at 9:43
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    $\begingroup$ Welcome to Mma.SE! Your question needs more from your side. Here it's considered helpful and polite to show your own efforts and share your data and code attempts in a well formatted form, so we can quickly see the problem you are facing. Please help us to help you and edit your question accordingly. Also, please take the tour, it will help you understand the site. Learning about asking and what's on-topic will help to write an excellent question and inspire great answers. $\endgroup$ – rhermans Aug 8 '19 at 9:49
  • $\begingroup$ Note the map from $x$ to $y$ is not necessarily a function, as there could be multiple $y$ for a single $x$. $\endgroup$ – Silvia Aug 8 '19 at 11:09

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