Beginning Algebra, 11th Edition

CHAPTER 3 Test^245

Write an equation for each line. Give the final answer in slope-intercept form.

14.Through 15.The line in Exercise 13

16.Through and

Graph each linear inequality.

The graph shows worldwide snowmobile sales from 2000 through 2007, where 2000 corre-

sponds to x=0.Use the graph to work Exercises 19–22.

x+y... 3 3 x-y 70

1 2, - 62 1 1, 3 2

1 - 1, 4 2 ,m= 2

x

y

0

0

50

100

150

200

250

1723456

Source: http://www.snowmobile.org

Sales (in thousands)

Year

Worldwide Snowmobile Sales

y

x

209

160

19.Is the slope of the line in the graph positive or negative? Explain.

20.Write two ordered pairs for the data points shown in the graph. Use them to write an equa-

tion of a line that models the data. Give the equation in slope-intercept form.

21.Use the equation from Exercise 20to approximate worldwide snowmobile sales for 2005.

How does your answer compare to the actual sales of 173.7 thousand?

22.What does the ordered pair mean in the context of this problem?

23.Decide whether each relation represents a function. If it does, give the domain and the range.

(a) (b)

24.Use the vertical line test to determine whether the graph is that of a function.

25.If find ƒƒ 1 x 2 = 3 x+7, 1 - 22.

51 2, 3 2 , 1 2, 4 2 , 1 2, 5 26 51 0, 2 2 , 1 1, 2 2 , 1 2, 2 26

1 7, 160 2