Line graphs easily and clearly present a large quantity of statistical data. Economists use line graphs to illustrate patterns or trends over time and to explain the relationship between two or more variables. A variable is a factor with a value that can change.

1. Identify the type of information presented on the graph.

2. Read the data shown on the graph. Studying graph's axes carefully.

3. Study the data shown on the graph to look for relationships or draw conclusions about a topic.