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: