Effective ways of displaying information

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# 1 Graphs, charts and matrices

## 1.1 Line graphs

A line graph is a method of showing a relationship between two variables, such as the output of an organisation and the associated costs. There are some special terms that you need to understand in order to create and interpret line graphs. These terms include: the axes, the origin, the intercept and the slope (or gradient).

Table 1 contains data about the output of an organisation and the associated total costs. The relationship between the output and the total costs of producing the output is as expected, that is, the costs rise as the output rises.

### Table 1: Output and total costs

Output Total costs (£)
0 10
10 30
20 50
30 70
40 90

These data can be displayed in a line graph as shown in Figure 1.

Figure 1: Output and total costs — a line graph
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