Identifying functions  Relations and Functions
Identifying functions
Bring on more grid papers! In this chapter, we're going to study functions. Functions are notations that tell us what the value of y is for every value of x. By carrying out the vertical line test, we are able to find out the relationships of ordered pairs.
Basic concepts:
 Solving linear equations by graphing
 Relationship between two variables
 Understand relations between x and yintercepts
 Domain and range of a function
Related concepts:
 Introduction to quadratic functions
 Basic radical functions
Lessons
Notes:
Relations: Sets of ordered pairs ( x , y )
Function: For every value of x, there is a value of y. It will need to pass the vertical line test.
OneToOne Function: For every one value of x, there is only one value of y, and vice versa. It will need to pass both vertical and horizontal line test.
Vertical line Test: A vertical line that intersects the graph of the equation only once when moves from across on the xaxis.

a)
 What is a function?
 How to do the Vertical Line Test?


1.
Are the following sets of ordered pairs functions?

3.
Using the table of values to answer the questions below: