This topic covers an introduction to functions. This series of three lessons introduces the student to a definition of a function. Many definitions related to functions are given.

This topic also covers whether a given graph represents a function or a relationship between two variables.

### Functions: Definitions

This lesson introduces the student to functions. The instruction defines the domain and range of a function, as well. Then, the student learns the definition for function. They also learn that relationships between numbers that are not functions are called relations.

### Functions: Notation

In this lesson the student learns the standard f(x) notation for a function. They also learn the terms independent and dependent variable.

### Functions: Vertical Line Test

In this lesson, the student learns about the vertical line test. The lesson explains that the vertical line test is used to determine whether a graph of a two variable relationship is a function or is just a relation.

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