# How to Make a Line Chart with GeoGebra

You can use `GeoGebra` to make two kinds of line charts.

The first kind is a line chart where the observation times are discrete. I’ll show you how to make this kind of line chart in Item 6.

The second kind is a line chart where the observation times are intervals, where the line chart connects the middle points of the bins in a histogram.

So in order to make a line chart of this kind in `GeoGebra`, you have to make a histogram first. I’ll show you how to make this kind of line chart in Item 7.

`GeoGebra` Instruction 1

### LineChartwithDiscreteObservationTimes

1.
Open `Algebra View`, `Graphics View` and `Spreadsheet` under  `View` in  `Menu`.
2.
Enter the observation times converted to hours (e.g. `9.30`AM is entered as `9.5`) in column `A`.
3.
Enter your observations in column `B`.
4.
Make a list by selecting all observation times and click `List`  in `Toolbar`. In the pop-up window that appears, change `Name` to “Times” and click `OK`.
5.
Make a list by selecting all observations and click `List`  in `Toolbar`. In the pop-up window that appears, change `Name` to “Observations” and click `OK`.
6.
In `Algebra View`, type

LineGraph(<List of x-coordinates>, <List of y-coordinates>)

and replace `<List of x-coordinates>` with `Times`, and `<List of y-coordinates>` with `Observations`.

The line chart is displayed in `Algebra View`.

`GeoGebra` Instruction 2

### LineChartwithContinuousObservationTimes

1.
Open `Algebra View`, `Graphics View` and `Spreadsheet` under  `View` in  `Menu`.
2.
Enter the lower endpoint of the first interval in column `A`.
3.
Enter the upper endpoint of each interval (including the first one) in the cells below.
4.
Enter your observations in column `B`. Check that you have one more filled-in cell in column `A` than in column `B`.
5.
Make a list by selecting all observation times and click `List`  in `Toolbar`. In the pop-up window that appears, change `Name` to “ClassBoundaries” and click `OK`.
6.
Make a list by selecting all observations and click `List`  in `Toolbar`. In the pop-up window that appears, change `Name` to “Observations” and click `OK`.
7.
Use the command

FrequencyPolygon(<List of Class Boundaries>, <List of Heights>)

in `Algebra View`. Insert “ClassBoundaries” as `<List of Class Boundaries>` and insert “Observations” as `<List of Heights>`. Press `Enter`.

Your line chart will be displayed in `Graphics View`. Remember to adjust the window so that the entire chart is visible.