Modeling: Line Graphs

Modeling

The line graph shows the population of Sun City over a 20-year period.

Year	Population of Sun City (in thousands)
1975	30
1980	32
1985	40
1990	45
1995	55

Using the graph above, determine how much the population of Sun City increased from 1980 to 1990?

Solution: From the graph determine the populations for 1980 and 1990.

then subtract their values to find the answer.

Answer: The population of Sun City increased by 13,000 people.

NOTE: Read the question carefully, then read the graph carefully. Pay particular attention to the scale.

TRY THIS ONE

Using the graph above, during which 5-year period was the increase in the population the greatest?

Now practice. Use the graph above for Exercises 1-4

1. During which 5-year period was the increase in the population the least?	3. How much did the population of Sun City increase from 1985 to 1995
2. How much did the population of Sun City increase from 1975 to 1985?	4. How much did the population of Sun City increase from 1975 to 1995