Page 144 - Algebra 1

Example
3
Interpreting Line and Double-line Graphs
The double-line graph shows the same data as the double-bar graph in Example 1.
20 16 12
8 4 0
Sandwich Shop
2001 2002 2003 2004 2005 2006
Key
Sal’s Deli
Harry’s Deli
What conclusions can you make from each graph?
SOLUTION
Math Reasoning
Predict If the number
of shops Harry owns increases at the same yearly rate, how many shops will he own in 2010?
• Sal had fewer sandwich shops than Harry in 2001, but in 2004 they both had the same number of sandwich shops.
• The graph of Harry’s shops is a straight line that shows a steady increase in the number of shops each year.
• Harry had 6 more shops than Sal in 2001, they both had 14 shops in 2004, and Harry had 11 more shops than Sal in 2006.
Comparing Data using Double-Bar Graphs
The table shows Andre’s bank account transactions.
Make a graph to compare the deposits and withdrawals.
Example
4
Month
January
February
March
April
May
June
Deposits
$475
$200
$350
$425
$500
$150
Withdrawals
$100
$275
$350
$400
$200
$225
SOLUTION Use a double-bar graph to compare the deposits and withdrawals.
• The graph shows that the deposits were greater than the withdrawals in January, April, and May.
• The withdrawals were greater than the deposits in February and June.
• Andre deposited and withdrew the same amount of money in March.
600 500 400 300 200 100
0
Deposits Withdrawal
Lesson 22 129
January February March April May June
Dollars
Number of Sandwich Shops