# Parallel And Perpendicular Lines Worksheet Page 26

JOBS
45.
Ann MacDonald is a salesperson at a discount appliance store. She earns
\$50 for each appliance that she sells plus a 5% commission on the price of the
appliance. Write an equation that represents what she earned in a week in which
she sold 15 appliances.
For Exercises 46–49, use the following information.
The Rainbow Paint Company sells an average of 750 gallons of paint each day.
46. How many gallons of paint will they sell in x days?
47. The store has 10,800 gallons of paint in stock. Write an equation in slope-intercept
form that describes how many gallons of paint will be on hand after x days if no
48. Draw a graph that represents the number of gallons of paint on hand at any
given time.
49. If it takes 4 days to receive a shipment of paint from the manufacturer after it is
ordered, when should the store manager order more paint so that the store does
not run out?
MAPS
For Exercises 50 and 51, use the
˚
40
60
following information.
˚
20
40
Suppose a map of Texas is placed on a
˚
˚
˚
˚
˚
20
0
20
40
40
˚
0
GAINES
20
coordinate plane with the western tip at
20
40 60 80 100 120 140 160 180
˚
20
the origin. Jeff Davis, Pecos, and Brewster
O
˚
40
counties meet at (130,
70), and Jeff
20
Davis, Reeves, and Pecos counties meet at
40
Maps
(120,
60).
60
Global coordinates are
50. Write an equation in slope-intercept
80
usually stated latitude, the
form that models the county line
100
angular distance north or
between Jeff Davis and Reeves
south of the equator, and
120
counties.
longitude, the angular
140
distance east or west of
51. The line separating Reeves and
the prime meridian.
Pecos counties runs perpendicular
Source:
to the Jeff Davis/Reeves county line. Write an equation in slope-intercept form
of the line that contains the Reeves/Pecos county line.
52.
CRITICAL THINKING
The point-slope form of an equation of a line can be
rewritten as y
m(x
x
)
y
. Describe how the graph of y
m(x
x
)
y
1
1
1
1
is related to the graph of y
mx.
53.
WRITING IN MATH
Answer the question that was posed at the beginning
of the lesson.
How can the equation of a line describe cellular telephone service?
• an explanation of how the fee for air time affects the equation, and
• a description of how you can use equations to compare various plans.
Standardized
54. What is the slope of a line perpendicular to the line represented by
Test Practice
2x
8y
16?
1
1
A
4
B
2
C
D
4
4
2
55.
ALGEBRA
What are all of the values of y for which y
1?
y
1
1
y
1
y
1
y
1
A
B
C
D
Lesson 3-4 Equations of Lines 149