Understand that a function is a rule that assigns to each input exactly one output

What you'll learn

1. Define a function as a rule that assigns to each input exactly one output
2. Determine whether a given relationship (table, set of ordered pairs, graph, or verbal description) is a function or not a function
3. Represent a function as a set of ordered pairs and plot those pairs on a coordinate plane
4. Apply the vertical line test to determine whether a graph represents a function
5. Explain in their own words why a relationship that assigns two different outputs to the same input is not a function

Prerequisites

• Use similar triangles to explain why the slope m is the same between any two distinct points on a non-vertical line