Algebra-1

Question Analysis
This question evaluates the understanding of the difference between equations and functions, specifically using the equation of a circle as an example.

Key Concept Explanation
An equation like represents a circle, and for certain values of , there can be multiple values of . This violates the condition for a function, which requires each input to have exactly one output.

Step-by-step Solution
1. Substitute into the equation :

Click "Show Answer" to reveal the answer and analysis