Functions,+Domain,+Range,+and+Test+for+Functions

=MEGAN MCNALLY = What is a function???? - A function tells you how to match up one group of numbers with another group of numbers.

The basics to [|domain range and functions] -EXAMPLE: Identify the domain and range of the given relations. Please represent them in a mapping diagram

(-2,3), (1,2), (3,-1), (-4,-3)

Domain = {-2, 1, 3, -4} Range = {3, 2, -1, -3

How to test a function using [|the vertical line test] (scroll down to the graphs). - if you put your pencil parallel to the y-axis and it crosses the lines in 2 places (picture 1) then it is not a function. If your pencil only crosses one line (picture 2) then it is a function.