The document is a lesson on line graphs that includes vocabulary definitions, examples of line graphs using sample data, and practice questions. It introduces line graphs as displays of data using line segments to show change over time. Students are given sample data on Millie's savings account and US minimum wage by year to create line graphs. They then answer questions to practice reading the line graphs, such as identifying the year with the highest US average weekly earnings and how minimum wage has changed since 1970.