When we need to draw a graph to represent information, we must always take care with accuracy, using a ruler to ensure the axes are straight and choosing our scale carefully (how many do you think are a sensible number of steps on a scale so that the graph will be useful?)

If the graph is drawn accurately, we will be able to use it to read off new information.

**Example**

**Exercise**

Let’s complete exercise 11C on pages 163 to 164 of the textbook:

The answers are below: