### Home > PC3 > Chapter 1 > Lesson 1.1.1 > Problem 1-5

1-5.

All of the graphs used in your Team Sort were functions. Describe what it means for a graph to be a “function.” Sketch two non-functions and explain why these two examples are not functions.

A function must have exactly one output for every input.

Think about what happens to functions rotated 90º or some of the conic functions.