Transcript File

Example 1: Fill in the table with the order pairs for the ratios that
describe the number of CDs to their cost. Then graph the ordered pairs
and describe the pattern.
Cost to Create CDs
Number of
CDs, x
Cost in
Dollars, y
Ordered
Pair (x, y)
1
3
(1, 3)
2
6
(2, 6)
3
9
(3, 9)
Pattern: The points form a straight line. Each point is one
unit to the right and three units up from the previous
point. So, the cost increases by $3 for every CD created.
Example 2: Two friends are making scrapbooks. Renée places 4 photos
on each page of her scrapbook. Gina places 6 photos on each page of
her scrapbook. How do the ratios to each page for person compare?
Renée’s Scrapbook
Gina’s Scrapbook
Pages, x
Photos, y
(x, y)
Pages, x
Photos, y
(x, y)
1
4
(1, 4)
1
6
(1, 6)
2
8
(2, 8)
2
12
(2, 12)
3
12
(3, 12)
3
18
(3, 18)
4
16
(3, 16)
4
24
(3, 24)
Comparison: The ratio of photos to pages for Renée’s
scrapbook is 4:1 while the ratio of Gina’s is 6:1. On the
graph, both sets of points are in a straight line but Gina’s
points are steeper than Renée’s.
The table below shows Gloria’s earnings for 1, 2 and 3 hours.
Fill in the ordered pairs column of the table. Then, graph the
ordered pairs and describe the pattern in the graph.
Gloria’s Earnings
Hours, x
Dollars
Earned, y
Ordered
Pair (x, y)
1
5
( , )
2
10
( , )
3
15
( , )
Pattern:
Two friends are each saving money in their bank accounts. Marcus
saves $10 each week while David saves $15 per week. Complete
each table. Then, graph each person’s ordered pairs.
Marcus’ Savings
David’s Savings
Weeks, x
Savings, y
(x, y)
Weeks, x
Savings, y
(x, y)
1
10
( , )
1
15
( , )
2
20
( , )
2
30
( , )
3
30
( , )
3
45
( , )
4
40
( , )
4
60
( , )
How do the ratios of Marcus’ savings and
David’s savings compare?