Algebra-1

Question Analysis
This question tests the student's understanding of the difference between equations and functions. The key concept is that an equation does not necessarily restrict one input to a unique output, while a function does.

Key Concept Explanation
An equation is a mathematical statement that expresses the equality between two expressions. It does not require a unique corresponding relationship between variables; one input can correspond to multiple outputs. A function, on the other hand, is a special type of relationship where each input (independent variable) has a unique output (dependent variable).

Step-by-step Solution
1. Consider the equation .
2. For a given value of , solve for .
3. Notice that for a specific , there are two possible values of :

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