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one-and two-variable data graphs to answer questions
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UNDERLYING SKILLS AND CONCEPTS:
coordinate grid
ordered pairs
number patterns
Interpret Line Graphs
A line graph shows change over time.
a
K
ey Ide
You can use a coordinate grid and ordered pairs to make
a line graph.
You can use a line graph to ask and answer questions about data.
1
How much did the sales in Gloria’s Picture
Book increase from February to March?
Gloria’s Picture Book sold 20 copies in
February and 25 copies in March.
Find 25 ! 20 to find the increase in sales.
25 ! 20 " 5
Gloria’s Book Sales
50
40
30
20
10
0
Jan
Five more copies were sold in March than in
February.
E x am p l E
Apr
June
May
h
2
10 20 30 40 50
Dollars earned 30 60 90 120 150
How much does Gloria earn for every 30
books sold?
Find where 30 books intersects dollars earned.
She earns $90 for 30 books sold.
Gloria’s Earnings
150
120
Dollars Earned
Gloria's Earnings
page 344
Mar
M
Use the table or the graph.
Books sold
Feb
90
60
30
0
10 20 30 40 50
Number of Books Sold
Chapter 29 – Lesson 4
D – © CSL Associates, Inc. All rights reserved.
The graph shows how many copies of Gloria’s
Picture Book were sold each month from
January to June.
Number of Books Sold
E x am p l E
Name
P RAC T I C E
1. In which month were the most
boxes of candles sold?
December
2. In which two months were the
sales less than 20 boxes?
August and January
3. How many boxes of candles were
sold in these six months?
10 20 35 25 50
15 155 boxes sold
Boxes of Candles Sold
Use the graph to answer each question.
Specialty Candle Sales
50
40
30
20
10
0
Aug
Sep
Oct
Nov
Jan
Dec
Month
D – © CSL Associates, Inc. All rights reserved.
Use the table. Complete the graph to show the same data.
4. Each box contains 8 candles.
The table shows total number
of candles per number of boxes.
Candles in Boxes
Boxes
Candles
1
2
8
16
3
4
5
24 32 40
1
Math
Reasoning
2
3
4
5
Represent Data
6
MR 1.1
5. How would the graph showing Candle Sales change (Exercises 1–3)
if you changed the scale to show every single box sold?
Possible answer: It would be much taller.
It would look like many more candles were sold.
Chapter 29 – Lesson 4
page 345
MCX94.HW.CL.G4.FM&Lesson.v211
8/2/04
19:17
Page 232
Name
…at home!
P RAC T I C E
Use the graph to answer each question.
November
2. In which two months were the
sales less than 20 boxes?
September and February
3. How many boxes of cards were
sold in these six months?
Specialty Card Sales
Boxes of Cards Sold
1. In which month were the most
boxes of cards sold?
50
40
30
20
10
0
10 20 50 25 40
15 160 boxes sold
Sep
Oct
Dec
Feb
Nov
Jan
Month
Use the table. Complete the graph to show the same data.
Title:
Cards in Boxes
Boxes
Cards
1
2
12 24
3
4
5
36 48 60
1
Math
Reasoning
2
3
4
5
Represent Data
6
MR 1.1
5. How would the graph showing Card Sales change (Exercises 1–3)
if you changed the scale to show every single box sold?
Possible answer: It would be much taller.
It would look like many more cards were sold.
page 232
Home Resource and Homework
Chapter 29 Lesson 4
D – © CSL Associates, Inc. All rights reserved.
4. Each box contains 12 cards.
The table shows total number
of cards per number of boxes.
MCX94TEG4Ch01_32.v8.5.2 2/26/01 19:06 Page 635
Name
P RAC T I C E
1. In which month were the most
boxes of candles sold?
December
2. In which two months were the
sales less than 20 boxes?
August and January
3. How many boxes of candles were
sold in these six months?
Boxes of Candles Sold
Use the graph to answer each question.
Specialty Candle Sales
50
40
30
20
10
0
10 20 35 25 50
15 155 boxes sold
Aug
Sep
Oct
Nov
Jan
Dec
Month
4. Each box contains 8 candles.
The table shows total number
of candles per number of boxes.
Candles in Boxes
Boxes
Candles
1
2
8
16
3
4
5
24 32 40
Title: Candles In Boxes
Number of Candles
D – © CSL Associates, Inc. All rights reserved.
Use the table. Complete the graph to show the same data.
40
32
24
16
8
0
1
2
3
4
5
6
Number of Boxes
Math
Reasoning
Represent Data
MR 1.1
5. How would the graph showing Candle Sales change (Exercises 1–3)
if you changed the scale to show every single box sold?
Possible answer: It would be much taller.
It would look like many more candles were sold.
Chapter 29 – Lesson 4
Student Book Page
page 345
Name
…at home!
P RAC T I C E
Use the graph to answer each question.
November
2. In which two months were the
sales less than 20 boxes?
September and February
3. How many boxes of cards were
sold in these six months?
Specialty Card Sales
Boxes of Cards Sold
1. In which month were the most
boxes of cards sold?
50
40
30
20
10
0
10 20 50 25 40
15 160 boxes sold
Sep
Oct
Dec
Feb
Nov
Jan
Month
Use the table. Complete the graph to show the same data.
Boxes
Cards
1
2
12 24
3
4
5
36 48 60
60
48
36
24
12
0
1
2
3
4
5
6
Number of Boxes
Math
Reasoning
Represent Data
MR 1.1
5. How would the graph showing Card Sales change (Exercises 1–3)
if you changed the scale to show every single box sold?
Possible answer: It would be much taller.
It would look like many more cards were sold.
page 232
Home Resource and Homework
Chapter 29 Lesson 4
D – © CSL Associates, Inc. All rights reserved.
Cards in Boxes
Title: Card Boxes
Number of Cards
4. Each box contains 12 cards.
The table shows total number
of cards per number of boxes.