# Introduction - Cartesian Plane, Relations and Functions, Function Notation

## Relations and Functions

Many things in the world around us can be described in terms of relationships and functions that operate on inputs to give meaningful outputs. The set of inputs is called the domain and the set of ouputs is called the range of the underlying relationship/function. Many complex objects are the "sum" of individual basic components. It is possible to understand how such complex objects work by understanding how the individual components work.

In this module we will learn about mathematical functions that form the foundation of calculus. The discussion centers around what a function is made of, how it operates, and its applications. By the end of this module, you should be able to

• Identify domain and range of a function
• Describe and notate a function using letters
• Evaluate a function
• Find the average rate of change in the value of a function with respect to changes in input values
• Find the difference quotient
• Graph a function  or a relationship
• Perform Vertical Line Test to tell if a graph represents a relationship or a function.
• Study transformations of functions