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Graphs modelling real situations
Graphs are a good way to show formulae in visual form.
For example, a taxi firm uses the following graph to work out the cost of a journey.
We can find out lots of different information from this graph.
The labels on each axis are very important. The horizontal line  or x axis  shows the number of miles. The vertical line  or y axis  tells us the cost.
There are two marked points at (0, 2) and (10, 7).
Read up from 6 miles on the x axis to the straight line. When you reach the line move across horizontally until you reach the y axis. The cost is £5. This means a journey of 6 miles will cost £5.
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