Students will explore the world water crisis in order to apply linear functions to the real world. Students will look at the relationships between many different variables as inputs and outputs including the number of miles you need to walk to get water and the number of gallons of water you can get in one trip. Students will complete a personal water audit to understand how much water their family uses in one day. They will answer the question, "How many miles would you need to walk to a well in an underdeveloped country to get the amount of water you use every day?" Students will explore linear functions using charts, graphs, and algebra. Students will answer many reasoning questions to explain their thinking about equations.