Page 153 - Math Course 2 (Book 2)

Lines of Fit
Mo. 11

Lesson 2
Let’s Begin

KEY CONCEPTS:
Make Predictions from a Line of Fit
1. Draw lines of fit for sets of data.
2. Use lines of fit to make predictions about
data. Examples

AGRICULTURE
MO. 11 - L2a The table shows the amount of land in U.S. Farms
from 1980 to 2000.
Drawing and Using Lines of Fit Make a scatter plot and draw a line of fit for the

data.

Year Land(million acres)
Vocabulary A-Z 1980 1039

Let us learn some vocabulary 1985 1012

1990 986
line of fit 1995 963
A line of fit is a line that is very close to most of the 2000 943
data points.

Answer
85
80
75 1050
70 1000
65
60 Amount of land (million acres) 950
55
50 900
45 0
40 ‘80 ‘85 ‘90 ‘95 ‘00 ‘05 ‘10
0 Year
1920 1940 1960 1980 2000
Year

Use the line of fit to predict the amount of land in the year 2010. 1050
1000
Extend the line so that you can find the y value for an x value of Amount of land 950
2010. The y value for 2010 is about892. So, a prediction for the (million acres)
amount of farm land in 2010 is approximately892 million acres. 900

0
‘80 ‘85 ‘90 ‘95 ‘00 ‘05 ‘10
Year
Answer about 892 million acres

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