Implicit Function/Examples/x^2 + y^2 - 25 = 0

Example of Implicit Function
Consider the equation:
 * $(1): \quad x^2 + y^2 - 25 = 0$

where $x, y \in \R$ are real variables.

Then $(1)$ defines $y$ as an implicit function of $x$ on the closed interval $\closedint {-5} 5$.