In this activity, we're going to be learning how to read and compare information presented in line graphs.

The following line graph shows the temperature of someone over a period of time.

The horizontal line represents the time (x-axis)

The vertical line represents the temperature in Fahrenheit ºF (y-axis) -* note that we don't use Fahrenheit very often - it is more usual to use degrees Celsius ºC*

The labels on the vertical and horizontal lines tell us what the information is representing.

The title tells us what the graph is representing.

** A line graph showing body temperature over time (minutes)**

Let's have a look at a question using this line graph.

**Example**

What was the** difference** in temperature after 2 minutes?

The x-axis starts at 0. This is representing time in this graph.

In this graph, the y-axis starts at 97ºF which is normal body temperature.

We travel along the x-axis to 2 minutes and then read up to the graph line (there is a black dot here).

We can see that the temperature is 98ºF

We can see that the temperature has gone up by 1ºF

**Answer**

The difference in temperature after 2 minutes is 1ºF

Interesting point: If this were a real temperature chart for somebody, they would be feeling pretty poorly with such a sudden increase in temperature! Some medicine would definitely be needed!

Good luck with the following questions.