Function Identification Quiz

Ready to put your function knowledge to the test? The Function Identification Quiz challenges you to decide whether a relation is a function — and explain why! This exciting review activity helps you apply everything you’ve learned about inputs, outputs, and rules to show that you truly understand how functions work.

You’ll see relations presented in different forms — tables, mappings, graphs, and equations. For each one, you’ll determine whether it represents a function by checking if every input (x-value) has exactly one output (y-value). You’ll also use tools like the vertical line test for graphs and look for repeated x-values in tables. Each question sharpens your observation and reasoning skills!

As you answer, you’ll practice thinking critically about patterns and consistency. Some examples will look tricky — like graphs that curve or tables with nearly identical pairs — but with focus and logic, you’ll learn to spot the difference between a true function and a non-function.