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We are asked whether the function provided is one-to-one (injective).

The function is represented as a set of ordered pairs:  
\[ f = \{(2, 5), (6, 4), (15, 2), (19, 8), (22, 9)\} \]

A function is **one-to-one** (injective) if no two distinct elements in the domain (the first element of each pair) are mapped to the same element in the range (the second element of each pair). In other words, each output (range value) must be paired with exactly one input (domain value).

Let’s check the range values (the second values in each pair):
- 5 (from the pair (2, 5))
- 4 (from the pair (6, 4))
- 2 (from the pair (15, 2))
- 8 (from the pair (19, 8))
- 9 (from the pair (22, 9))

Since all these range values are unique, no two distinct domain elements are mapped to the same range element. Therefore, the function is **one-to-one**.

Thus, the answer to the question is **True**

True or false? The function below is a one-to-one function.
f = {(2, 5), (6, 4), (15, 2), (19, 8), (22, 9)}

Check if the function f = {(2, 5), (6, 4), (15, 2), (19, 8), (22, 9)} is a one-to-one function by analyzing its range values. This example illustrates the concept of injective functions, suitable for students in Grades 9-11.

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