Introduction to Relations and Functions PDF

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Introduction to

Relations

and Functions

4.1Introduction to Relations

4.2Introduction to Functions

4.3Graphs of Functions

4.4Variation

255
In this chapterwe introduce the concept of a function. In general terms, a function defines how one variable depends on one or more other variables. The words in the puzzle are key terms found in this chapter.

Across

1. A type of variation such that

as one variable increases, the other increases.

4. A type of variation such

that as one variable increases, the other variable decreases.

5. A set of ordered pairs such

that for every element in the domain, there corresponds exactly one element in the range.

7. A set of ordered pairs.

Down

1. The set of first coordinates

of a set of ordered pairs.

2. The shape of the graph of a

quadratic function.

3. A function whose graph is a

horizontal line.

6. A function whose graph is a

line that is not vertical or horizontal.

7. The set of second

coordinates of a set of ordered pairs.14 2 3 5 6 7 IA 44
miL2872X_ch04_255-308 9/26/06 02:15 PM Page 255CONFIRMING PAGES

256Chapter 4Introduction to Relations and Functions

1. Domain and Range of a Relation

In many naturally occurring phenomena, two variables may be linked by some type of relationship. For instance, an archeologist finds the bones of a woman at an excavation site. One of the bones is a femur. The femur is the large bone in the thigh attached to the knee and hip. Table 4-1 shows a correspondence between the length of a woman's femur and her height. Each data point from Table 4-1 may be represented as an ordered pair. In this case, the first value represents the length of a woman's femur and the second, the woman's height. The set of ordered pairs {(45.5, 65.5), (48.2, 68.0), (41.8, 62.2), (46.0, 66.0), (50.4, 70.0)} defines a relation between femur length and height.

Finding the Domain and Range of a Relation

Find the domain and range of the relation linking the length of a woman' s femur to her height {(45.5, 65.5), (48.2, 68.0), (41.8, 62.2), (46.0, 66.0), (50.4, 70.0)}.

Solution:

Domain: {45.5, 48.2, 41.8, 46.0, 50.4} Set of first coordinates Range: {65.5, 68.0, 62.2, 66.0, 70.0} Set of second coordinates

1.Find the domain and range of the relation.

e10, 02, 1?8, 42, a1

2, 1b, 1?3, 42, 1?8, 02f

Skill Practice

Example 1

Table 4-1

Definition of a Relation in xand y

Any set of ordered pairs (x,y) is called a relation in xand y. Furthermore, • The set of first components in the ordered pairs is called the domain of the relation • The set of second components in the ordered pairs is called the range of the relation

Skill Practice Answers

1.Domain

range

50, 4, 16

e0, ?8, 1

2 , ?3f,

Length of Height

Femur (cm) (in.)Ordered Pair

45.5 65.5(45.5, 65.5)

48.2 68.0(48.2, 68.0)

41.8 62.2(41.8, 62.2)

46.0 66.0(46.0, 66.0)

50.4 70.0(50.4, 70.0)

Section 4.1Introduction to Relations

Concepts

1.Domain and Range of a

Relation

2.Applications InvolvingRelations

IA miL2872X_ch04_255-308 9/25/06 11:51 AM Page 256

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Section 4.1Introduction to Relations257

Finding the Domain and Range of a Relation

Find the domain and range of the relation

{(Alabama, 7), (California, 53), (Colorado, 7), (Florida, 25), (Kansas, 4)}

Solution:

Domain: {Alabama, California, Colorado, Florida, Kansas}

Range: {7, 53, 25, 4} (

Note:The element 7 is not listed twice.)

2.The table gives the longevity for four types of animals. Write the ordered

pairs ( x ,y) indicated by this relation, and state the domain and range. A relation may consist of a finite number of ordered pairs or an infinit e number of ordered pairs. Furthermore, a relation may be defined by several differ ent methods: by a list of ordered pairs, by a correspondence between the domainand range, by a graph, or by an equation.

Skill Practice

Example 2

The x- and y-components that constitute the ordered pairs in a relation do not need to be numerical.For example,Table 4-2 depicts five states in the United States and the corresponding number of representatives in the House of R ep- resentatives as of July 2005.

Table 4-2table 4-2

Number of

State Representatives

Alabama7

California53

Colorado7

Florida25

Kansas4

These data define a relation:

{(Alabama, 7), (California, 53), (Colorado, 7), (Florida, 25), (Kansas, 4)}

Skill Practice Answers

2.{(Bear, 22.5), (Cat, 11), (Deer, 12.5),

(Dog, 11)}; domain: {Bear, Cat, Deer,

Dog}, range: {22.5, 11, 12.5}

Animal, Longevity (years),

Bear22.5

Cat11

Deer12.5

Dog11 miL2872X_ch04_255-308 9/25/06 11:51 AM Page 257

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258Chapter 4Introduction to Relations and Functions

• A relation may be defined by a graph (Figure 4-2). The corresponding ordered pairs are {(1,2),(?3,4), (1,?4), (3, 4)}. • A relation may be expressed by an equation such as The solutions to this equation define an infinite set of ordered pairs of the form

The solutions can also be repre-

sented by a graph in a rectangular coordinate system (Figure 4-3).

51x, y2x?y

2 6.x?y 2

Figure 4-2

y x (1, 2)(?3, 4) (1, 4) (3, 4)

Finding the Domain and Range of a Relation

Find the domain and range of the relations:

Solution:

a.Domain: {3, 2,?7}

Range: {

Example 3

Figure 4-3

y x 5 4 3 2 1 1 2 3 4 5

1?1?2?3?4?52345

x y 2 23
7?9xy

Figure 4-1

3?42xy

DomainRange4

• A relation may be defined as a set of ordered pairs. {(1, 2), (?3, 4), (1,?4), (3, 4)} • A relation may be defined by a correspondence (Figure 4-1).The corresponding ordered pairs are {(1, 2), (1,?4), (?3, 4), (3, 4)}. IA miL2872X_ch04_255-308 9/25/06 11:51 AM Page 258

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Section 4.1Introduction to Relations259

y x

34?4?312

2?1 3 41
234
1?2 8 55
8y x 2?5 4 8 150
16

45?4?5?3123

2 3 4 5 45

1?1?2y

x 3 2 1

45?4?5?3123

2 3 4 5 45

1?1?2y

x 3 2 1 b.The domain elements are the x-coordinates of the points, and the range elements are the y -coordinates.

Domain: {

2,?1, 0, 1, 2}

Range: {

3, 0, 1}

c.The domain consists of an infinite number of x -values extending from

8 to 8 (shown in

red). The range consists of all y-values from

5 to 5 (shown in blue). Thus, the domain

and range must be expressed in set-builder notation or in interval notation.

Domain:

Range:

The arrows on the curve indicate that the

graph extends infinitely far up and to the right and infinitely far down and to the right.

Domain:

Range: is any real number} or

Find the domain and range of the relations.

3.4. 5.

Skill Practice

1 ??, ?25yyor 30, ?25xx is a real number and x?06 x?y 2

5?y?56 or 3?5, 545yy is a real number and?8?x?86

or 3?8, 845xx is a real number and y x

Skill Practice Answers

3.Domain {?5, 2, 4},

range {0, 8, 15, 16}quotesdbs_dbs20.pdfusesText_26

[PDF] Introduction to Relations and Functions

Introduction to

Relations

4.1Introduction to Relations

4.2Introduction to Functions

4.3Graphs of Functions

4.4Variation

Across

1. A type of variation such that

4. A type of variation such

5. A set of ordered pairs such

7. A set of ordered pairs.

1. The set of first coordinates

2. The shape of the graph of a

3. A function whose graph is a

6. A function whose graph is a

7. The set of second

256Chapter 4Introduction to Relations and Functions

1. Domain and Range of a Relation

Finding the Domain and Range of a Relation

Solution:

1.Find the domain and range of the relation.

2, 1b, 1?3, 42, 1?8, 02f

Skill Practice

Example 1

Table 4-1

Definition of a Relation in xand y

Skill Practice Answers

1.Domain

50, 4, 16

2 , ?3f,

Length of Height

Femur (cm) (in.)Ordered Pair

45.5 65.5(45.5, 65.5)

48.2 68.0(48.2, 68.0)

41.8 62.2(41.8, 62.2)

46.0 66.0(46.0, 66.0)

50.4 70.0(50.4, 70.0)

Section 4.1Introduction to Relations

Concepts

1.Domain and Range of a

Relation

2.Applications InvolvingRelations

CONFIRMING PAGES

Section 4.1Introduction to Relations257

Finding the Domain and Range of a Relation

Find the domain and range of the relation

Solution:

Range: {7, 53, 25, 4} (

Note:The element 7 is not listed twice.)

2.The table gives the longevity for four types of animals. Write the ordered

Skill Practice

Example 2

Table 4-2table 4-2

Number of

State Representatives

Alabama7

California53

Colorado7

Florida25

Kansas4

These data define a relation:

Skill Practice Answers

2.{(Bear, 22.5), (Cat, 11), (Deer, 12.5),

Dog}, range: {22.5, 11, 12.5}

Animal, Longevity (years),

Bear22.5

Deer12.5

CONFIRMING PAGES

258Chapter 4Introduction to Relations and Functions

The solutions can also be repre-

51x, y2x?y

Figure 4-2

Finding the Domain and Range of a Relation

Find the domain and range of the relations:

Solution:

Range: {

Example 3

Figure 4-3

1?1?2?3?4?52345

51x, y2x?y

5?y?56 or 3?5, 545yy is a real number and?8?x?86