1. **State the problem:** Determine if the given relation \{(-20,0), (19,18), (19,7), (19,8)\} is a function. 2. **Recall the definition of a function:** A relation is a function if every input (x-value) corresponds to exactly one output (y-value). 3. **Analyze the given relation:** The x-values are -20, 19, 19, 19. 4. **Check for repeated x-values:** The x-value 19 appears three times with different y-values 18, 7, and 8. 5. **Conclusion:** Since the x-value 19 corresponds to multiple y-values, this relation is **not** a function. **Final answer:** No, this relation is not a function.