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Everyday maths 1 (Wales)

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6 Line graphs

Now that you’ve had a look at pie charts and bar charts, let’s take a look at line graphs. These are drawn by marking (or plotting) points and then joining them with a straight line. You might have seen them used in holiday brochures or maybe on the television.

Figure 16 Interest rates line graph

Hint: It is best to use graph or squared paper when drawing line graphs because it makes it easier to plot the points.

Example: The estate agent

How would you present information as a line graph? Watch the following video to find out.

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Method summary

To draw a line graph you need to:

• draw the horizontal and vertical axes, and label them
• divide these axes into suitable scales – to do this, you need to look at the data and find out what the smallest and largest numbers are
• plot the points from your data, using a pencil to make small crosses
• join the points using a ruler
• give your graph a title.

Now try the following activity. Remember to check your answers once you have completed the questions.

Activity 13: Creating a line graph

Line graphs are often used in holiday brochures to show temperatures or hours of sunshine at a particular resort.

The following table shows the hours of sunshine at a holiday resort. Draw a line graph using the data from the table and then answer the questions below.

Month Hours of sunshine
May 6
June 7
July 8
August 9
September 8
October 7
1. Which month was the sunniest?
2. Which month had the least sunshine?

When drawing your line graph you should:

• draw the horizontal axis, labelling it ‘Months’, and the vertical axis, labelling it ‘Hours of sunshine’
• divide these axes into suitable scales – your smallest and largest numbers are 6 and 9, so your scale could be one square for one hour
• plot the points from your data, using a pencil and make small crosses
• join the points using a ruler
• give your graph a title such as ‘Hours of sunshine at a holiday resort over a six-month period’.

The finished line graph should look something like this:

Figure 17 Sunshine line graph