Algebra-2

Question Analysis
The question tests the understanding of the definition of a function. A function requires that each input value (x-value) corresponds to exactly one output value (y-value). In this case, the x-value 12 corresponds to two different y-values (18 and 22), which violates the definition of a function.

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). This means that for any given x-value, there should be only one corresponding y-value.

Step-by-step Solution
1. List the ordered pairs: {(12, 18), (15, 20), (12, 22), (17, 24), (19, 26)}
2. Check for duplicate x-values: The x-value 12 appears...