Presentation on theme: "Bellringer 1. 2. 3.. Chapter 5 Section 2 Relations and Functions Woohoo!!!"— Presentation transcript:
Chapter 5 Section 2 Relations and Functions Woohoo!!!
Some key terms Relation- a set of ordered pairs Domain- the set of first coordinates, the xs Range- the set of second coordinates, the ys
Functions Function- a function is a relation in which each member of the domain is paired with exactly one member of the range In other words… you can not have a domain (x value) repeat itself Vertical Line Test- If any vertical line passes through no more than one point of the graph of a relation then the relation is a function
How to tell if it is a function Since each element of the domain is paired with exactly one element of the range this is a function. Also, notice no x values are repeated
How to tell if it is a function This is called a mapping. It shows the relation between each x and y value It does not matter that the y values are shared as long as the x value is not repeated or shared this is a function X235X235 Y30Y30
Functional notation An equation looks like this – y = 3x + 5 This same equation written in functional notation looks like this – f(x) = 3x + 5 – We simply replace y with f(x)