Intermediate Algebra (11th edition)

17.The bar graph shows median household in-

come for Asians and Pacific Islanders in the

United States.

(a)Use the information for the years 2001

and 2007 to find an equation that models

the data. Let represent 2001,

represent 2007, and y represent

the median income. Write the equation

in slope-intercept form.

(b)Use the equation from part (a) to

approximate median household income

for 2005 to the nearest dollar. How does

your result compare against the actual

value, $61,094?

x= 7

x= 1

CHAPTER 3 Test 205

1.Complete the table of ordered pairs for the equation 2 x- 3 y= 12.

TEST

CHAPTER 3

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

Step-by-step test solutions are found on the Chapter Test Prep Videos

available via the Video Resources on DVD, in , or on

(search “LialIntermediateAlg”).

CHAPTER

VIDEOS

Find the x- and y-intercepts, and graph each equation.

2. 
   
   
   
   3. 
      
      
      
      4. 5.Find the slope of the line through the points and.
         6.Describe how the graph of a line with undefined slope is situated in a rectangular coor-
         dinate system.
      
      
      
      
   
   
   
   

Determine whether each pair of lines isparallel, perpendicular,orneither.

7. and


8. and
   9.In 1980, there were 119,000 farms in Iowa. As of 2008, there were 93,000. Find and in-
   terpret the average rate of change in the number of farms per year, to the nearest whole
   number. (Source:U.S. Department of Agriculture.)

Find an equation of each line, and write it in (a)slope-intercept form if possible and (b)stan-

dard form.

10.Through ; 11.Through ; horizontal

12.Through and 13.Through vertical

14.Through and parallel to

15.Through and perpendicular to

16.Concept Check Which line has positive slope and negative y-coordinate for its y-intercept?

A. B. C. D.

1 - 7, 2 2 y= 2 x

1 - 7, 2 2 3 x+ 5 y= 6

1 - 2, 3 2 1 6, - 12 1 5, - 62 ;

1 4, - 12 m=- 5 1 - 3, 14 2

2 y= 3 x+ 12 3 y= 2 x- 5

5 x-y= 8 5 y=-x+ 3

1 6, 4 2 1 - 4, - 12

3 x- 2 y= 20 y= 5 x= 2

xy

1

3

• 4

x

y

0

x

y

0 x

y

0 x

y

0

Median Household Income

for Asians and Pacific Islanders

Source: U.S. Census Bureau.

Year

Dollars

80,000

60,000

40,000

20,000

0

2001 2003 2005 2007

53,635

66,103