Proportions can be shown graphically. A direct proportion will be shown as a straight line, passing through the origin (0,0).
Drawing a graph allows the proportion of different values to be obtained. By reading one scale, the graph can be used to determine the other proportion value.
1. The exchange rate for Euros to British Pounds is €1 = £0.80. Draw a graph for the exchange rate for values from €0 to €180. Using the graph, determine the number of British Pounds that can be obtained for €140.
2. Using the graph, above, how many Euros would I receive for £100?