Using Graphs to Find Rate of Change

We learned that the slope of a line can tell us the Rate of Change.
(Click here for the lesson on using slope to find rate of change)

Now we will be using graphing tools to find Rate of Change.

To use a graphing tool, we must first create coordinates from the data we're examining.
To explain this, lets look at the following example.

Suppose that at 3pm we enter the highway at mile-marker 25. At 5pm we exit the highway at mile-marker 85.

This information gives us two data sets that we can use as coordinates. Remember that coordinates are recorded as (x, y). In most cases, time will be used for the x values.
Therefore, the first data set gives the coordinate (3, 25) and the second data set gives the coordinate (5, 85).

Now that we've sorted our data into coordinates, its time to insert them into a graphing tool.

There are many tools for graphing, but for this exercise, I'll be showing you MS Office and GeoGebra.

Click on the software below that you will be using. Check with your instructor to see which software he/she would like you to use.