You can also show data on
a line graph. A line graph shows how an
amount changes over time
or changes that occur in related variables.
You can plot several different
sets of data on one graph.
1. What trend does the line graph show?
2. How does the line graph visually display this trend?
3. Here is the table
of data that formed this graph:
| Year | Millions of in-Line Roller Skaters |
| 1989 | 3 |
| 1990 | 4.3 |
| 1991 | 6 |
| 1992 | 9.4 |
* Why might someone find
the line graph more helpful than the table
of data?
4. About how many skaters were there in 1991?
5. Between what two
years was there the greatest increase?
This next line graph has
two sets of data on one graph.
It shows the results of
an experiment which compared the rate of
evaporation of water.
In the control set-up, the water was on a table.
In the experimental set-up,
the water was on a hotplate.
1. What would you predict
would be the level of the water in the
experimental setup on day
number 8?
2. How does the data
shown on a line graph differ from the data shown on a
circle graph or a bar graph?
Go to: bar
graphs
circle
graphs
line
graphs
