Use variables to represent two quantities in a real-world problem that change in relationship to one another

What you'll learn

1. Identify the independent variable (input/controlled quantity) and the dependent variable (output/determined quantity) in a real-world situation, and explain why each variable belongs on its respective axis
2. Write an equation expressing the dependent variable in terms of the independent variable
3. Generate a table of ordered pairs by substituting values of the independent variable (starting at 0) into the equation
4. Plot ordered pairs from the table on the coordinate plane and interpret the graph -- identifying where the line starts (y-intercept as starting value) and how fast it rises (steepness as rate of change) -- in the context of the original problem

Prerequisites

• Use variables to represent numbers and write expressions
• Use ratio and rate reasoning to solve real-world and mathematical problems