Algebra-1

Question Analysis
This question tests the understanding of the difference between equations and functions, specifically focusing on the concept that a function must have a unique output for each input.

Key Concept Explanation
A function is a special type of relationship where each input (independent variable) has a unique output (dependent variable). In contrast, an equation can have multiple outputs for a single input, which is the case for the equation of a circle.

Step-by-step Solution
1. Consider the equation .
2. Substitute into the equation: .
3. Simplify to get .
4. Solve for

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