Algebra-2

Question Analysis
The question tests the understanding of the definition of a function using a mapping diagram. A relation is a function if each input value (element in the domain) points to only one output value (element in the range).

Key Concept Explanation
A function is a special type of relation where each element in the domain (input values) corresponds to exactly one element in the range (output values).

Step-by-step Solution
1. List all input values: 3, 6, 9
2. Check if each input value points to only one output value: Each input (3, 6, 9) points...