Beginning Algebra, 11th Edition

244 CHAPTER 3 Linear Equations and Inequalities in Two Variables; Functions

The percents of four-year college students in public schools who earned a degree within

five years of entry between 2002 and 2007 are shown in the graph. Use the graph to work

Exercises 63–66.

63.Since the points of the graph lie

approximately in a linear pattern, a

straight line can be used to model

the data. Will this line have posi-

tive or negative slope? Explain.

64.Write two ordered pairs for the

data for 2002 and 2007.

65.Use the two ordered pairs from

Exercise 64to write an equation of

a line that models the data. Give the

equation in slope-intercept form.

66.Use the equation from Exercise 65

to approximate the percents for

2003 through 2006.

0

41

40

44

43

42

45

y

x

2002 2003 2004 2005

Year

Percent

Source: ACT.

Percents of Students

Graduating Within 5 Years

(Public Institutions)

43.7

2006 2007

41.2

1.Complete the ordered pairs for the equation

2.Is a solution of

3.How do you find the x-intercept of the graph of a linear equation in two variables? How

do you find the y-intercept?

Graph each linear equation. Give the x- and y-intercepts.

Find the slope of each line.

9.Through and 10.

11. 12.A line parallel to the graph of


12. 
    

x+ 12 = 0 y- 4 = 6

1 - 4, 6 2 1 - 1, - 22 2 x+y= 10

y= 1 x-y= 4

3 x+y= 6 y- 2 x= 0 x+ 3 = 0

1 4, - 12 4 x- 7 y=9?

1 0, 2 , 1 , 0 2 , 1 , - 32 3 x+ 5 y=-30.

TEST

CHAPTER 3 Step-by-step test solutions are found on the Chapter Test Prep Videos
available via the Video Resources on DVD, in , or on
(search “LialBeginningAlgebra”).

CHAPTER

VIDEOS

View the complete solutions to
all Chapter Test exercises on
the Video Resources on DVD.

x

y

0

1

–4

2

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