 is the set of all possible input values that the function can accept. The input values are the independent variable on the first, or horizontal, axis.

 is the set of all possible output values. The output values are the dependent variable on the second, or vertical, axis. 

A function is a relationship between two — or more — variables. If you input a number into a function, it can only output one value.

Every point in the coordinate system has coordinates of the form 

. The first coordinate tells you where the point is along the 

-axis, and the second coordinate tells you where the point is placed along the 

The horizontal axis in a coordinate system

The vertical axis in a coordinate system. Often called 

Mathagon

Definition

Evaluating a Function

Function Table

Drawing a Graph

Read a Graph

Domain and Range

What Are Functions?

Introduction

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