# Drawing, reading and interpreting line graphs

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## Line graphs

A line graph is used to show how things change over time. Monthly rainfall statistics at a particular place might be shown by a line graph. Line graphs have a horizontal axis and a vertical axis, each with different scales. By reading the unit along one axis, it is easy to find the information required.

The data is plotted on the graph in a series of points. These points are then joined with lines to show differences which occur over a period of time. Information can also be taken from any of the points which fall along the line.

Example 1:

Once again, a heading, scale and clear labelling are all important components of line graphs. You can see that July and August are dry months in Tropictown.

Example 2:

In this line graph, Sue is taking a day's outing in the country.She leaves home at 9:00am and returns at 5:00pm. The graph records her distance from home at hourly intervals.The plotted points have been linked to create the line.

The graph tells the story of Sue's day.The two flat sections of the graph indicate times when she stopped for morning tea and lunch.The steepest sections of the graph show the times when she travelled the furthest distance.

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### Question 1/5

1. From the graph for Sue's drive to the country (Example 2), we find that the total distance Sue drives is

 0km 320km 8 hours 160km

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