Algebra-1

Question Analysis
This question tests the basic definition of a function. The key concept is that in a function, each input must correspond to exactly one output.

Key Concept Explanation
A function is a special type of relationship where each input (independent variable) has a unique output (dependent variable). This uniqueness is a fundamental property that distinguishes functions from general equations.

Step-by-step Solution
1. Identify the key property of a function: each input must hav...