1. **State the problem:** We are given the set of ordered pairs \(\{(1, 2), (2, 3), (3, 4), (3, 5), (4, 3)\}\) and asked which coordinate must be removed so that the set represents a function. 2. **Recall the definition of a function:** A function assigns exactly one output (y-value) for each input (x-value). This means no x-value can be repeated with different y-values. 3. **Identify repeated x-values:** In the set, the x-value 3 appears twice with different y-values: \( (3, 4) \) and \( (3, 5) \). 4. **Determine which coordinate to remove:** To make the set a function, remove one of the points with x = 3. Removing \( (3, 5) \) leaves \( (3, 4) \) and ensures each x-value is unique. **Final answer:** Remove the coordinate \( (3, 5) \) to make the set a function.