1. Standard: M8A3 c. Distinguish between relations that are functions and those that are not functions. Relations and Functions

2. A ________ is a set of __________________. relationordered pairs Relation = { (3,5),(-2,8),(-3,8),(0,-6) } The ________ is the ______ of ______ values. range set x The ________ is the ______ of ______ values. domain set y

3. EXAMPLE Relation = { (3,5),(-2,8),(-3,8),(0,-6) } Domain: { ____, ____, ___, ____} Range: {____, ___, ____}

4. EXAMPLE Relation = { (3,5),(-2,8),(-3,8),(0,-6) } Domain: { ____, ____, ___, ____} -3-203 Range: {____, ___, ____}

5. EXAMPLE Relation = { (3,5),(-2,8),(-3,8),(0,-6) } Domain: { ____, ____, ___, ____} Range: {____, ___, ____} -3-203 -658

6. Three other ways to represent a relation : 1. Mapping: -3 -2 0 3 -6 5 8 DomainRange

7. Three other ways to represent a relation : 2. Table: domainrange xy -3 -2 0 3 8 -6 5

8. Three other ways to represent a relation : 3. Graph:

9. Example 1:Represent the following relations as a set of ordered pairs. -2 0 5 6 -3 2 7 { } (-2, 2)(0, -3)(5, 7)(6, 7)

10. { } (2,0)(-2,2)(-2,-2)(-6, 2)

11. { } -3 0 2 4 x y 0 -2 3 -7 4 (-3,0)(-1,-2)(0,3)(2,-7)(4,4)

12. A ___________ is a relation in which no number in the _________ is __________. (the x-value can not repeat) function domainrepeated Functions can be represented four different ways: 1. ______________ 2. ______________ 3. ______________ 4. ______________ mapping graph table set of ordered pairs

13. Example 2:Represent the following function as a mapping, graph, and table. {(7,4),(-3,6),(5,8),(4,3),(1,-3)} -3 1 4 5 7 -3 3 4 6 8

14. {(7,4),(-3,6),(5,8),(4,3),(1,-3)}

15. -3 x y 1 4 5 7 6 3 8 4

16. Example 3: Are the following relations also functions? 0 -2 3 -7 -4 5 8 0 -2 3 -7 -4 5 8 Each element of the domain is only used once. FUNCTION 3 is used twice. NOT A FUNCTION

17. C Will all vertical lines cross the graph at only one point? FUNCTION YES. Each x is only used once.

18. D Will all vertical lines cross the graph at only one point? FUNCTION YES. Each x is only used once.

19. E Will all vertical lines cross the graph at only one point? NOT A FUNCTION NO. x =-3 is used twice.

20. F Will all vertical lines cross the graph at only one point? NOT A FUNCTION NO. x =-2 is used three times.

21. -4 -2 2 -4 x y 0 -3 3 1 Are all x values used only once? NO. x = - 4 is used twice. NOT A FUNCTION