3.3 Find an equation for each line. (a)Write the equation in slope-intercept form.
(b)Write the equation in standard form.
25.Slope y-intercept 26.Slope 0; y-intercept
27.Slope through 28.Slope 3; through
29.Vertical; through 30.Through and
31.Through and 32.The line pictured in Exercise 18
33.Parallel to and through
34.Perpendicular to and through
35.The Midwest Athletic Club offers two special membership plans. (Source:Midwest Ath-
letic Club.) For each plan, write a linear equation in slope-intercept form and give the
cost yin dollars of a 1-yr membership. Let xrepresent the number of months.
(a)Executive VIP/Gold membership: $159 fee, plus $57 per month
(b)Executive Regular/Silver membership: $159 fee, plus $47 per month
36.Revenue for skiing facilities in the United States is shown in the graph.
(a)Use the information given for the years
2003 and 2007, letting represent
2003, represent 2007, and y
represent revenue (in millions of
dollars) to find a linear equation that
models the data. Write the equation in
slope-intercept form. Interpret the
slope.
(b)Use your equation from part (a) to
estimate revenue for skiing facilities in
2008, to the nearest million.3.4 Graph the solution set of each inequality or compound inequality.
37. 38.
- and 40. or
41.Concept Check Which one of the following has as its graph a dashed boundary line and
shading below the line?
A. B. C. D.
3.5 In Exercises 42–45, give the domain and range of each relation. Identify any
functions.
44. 45.
51 - 4, 2 2 , 1 - 4, - 22 , 1 1, 5 2 , 1 1, - 526
yÚ 4 x+ 3 y 74 x+ 3 y... 4 x+ 3 y 64 x+ 32 x+y... 1 xÚ 2 y xÚ 2 yÚ 23 x- 2 y... 12 5 x-y 76x= 7x= 32 x- 5 y= 7 1 4, 3 24 x-y= 3 1 7, - 121 - 3, - 12 1 2, 6 2
1 2, 5 2 1 2, - 52 1 1, 4 2
-^43 ; 1 2, 7 2 1 - 1, 4 2
-^13 ; 1 0, - 12 1 0, - 22
CHAPTER 3 Review Exercises 203
Skiing RevenueSource: U.S. Census Bureau.YearMillions of Dollars2500200015001000
0
2003 2004 2005 2006 2007183924149
11
4
17
2532
47
69
14xy02–4 (^4) x
y
0