Students learn that quantities can vary in relation to each other and are often classifi ed as independent and dependent quantities. They solve for unknown values of a variable by analyzing a graph. Students then solve linear equations using the variety of tools available to them, and they contrast the advantages and limitations of each. Throughout the topic, students compare and contrast linear equations of the form y = x + c and y = cx, and their respective representations. Finally, they analyze three different distance, rate, and time scenarios and generalize the formula d = rt. Students are expected to use their knowledge of unit rate and unit conversion to solve these problems.