HousekeepingYesterday, we discussed the difference between a relation and a function.

Today we will continue identifying functions

Goal for today…Goal….* Determine if a set of points determine a function

Agenda…. Review definition of a

function Determine if a set of

points represent a function

Do you learn better by looking at visuals rather than reading

a definition?

In this lesson you will learn how to tell if a set of points represents a

function by looking at points plotted on a graph.

Let’s Review

A function is a relation in which a rule assigns every input a

unique output.

If I tell you the input, can you

predict the output?

Let’s Review

App Price

1 $2.00

2 $4.00

3 $6.00

4 $8.00

(1, 2)

(2, 4)(3, 6)

(4, 8)Number of Apps

Tota

l Pric

e

1 2 3 4 5 6

24681012

Input Outputyx

y

x

(x, y)

Function

Core Lesson

Name of SwimmerPat Jess Lee Adri

0.51.01.522.53

y

x

Swim

Tim

e

Swimmer Time (min)

Pat 2.5

Jess 2

Lee 3

Adri 2

Input Output

Predictable Penguins

Function

A Common Misunderstanding

Name of SwimmerPat Jess Lee Adri

0.51.01.522.53

y

x

Swim

Tim

e

Function

Core Lesson

Name of SwimmerStu Sam Sal Steve

0.51.01.522.53

y

x

Swim

Tim

e

Shifty Squids

Not a

Function

Core Lesson

1 2 3 4 5

y

x1 2 3 4 5

20406080100

y

x

Hours StudiedTe

st S

core

406080100

20

Number Wrong

Test

Sco

re Not a

FunctionFunction

Core Lesson

1 2 3 4 5 6

123456

y

xFunction

Core Lesson

1 2 3 4 5 6

123456

y

x

Not a

Function

In this lesson you have learned how to tell if a set of points

represents a function by looking at points plotted on a graph.

What now???Goal….* Determine if a set of points determine a function

Practice:

IXL Skill X.1