Use variables to represent two quantities in a real-world problem that change in relationship to one another; write an equation to express one quantity, thought of as the dependent variable, in terms of the other quantity, thought of as the independent variable. Analyze the relationship between the dependent and independent variables using graphs and tables, and relate these to the equation. (e.g., In a problem involving motion at constant speed, list and graph ordered pairs of distances and times, and write the equation d = 65t to represent the relationship between distance and time.)

Example Problems
A freight train carries c containers weighing w tons each and k pallets weighing q tons each, for a total load of L tons.
Write an equation that relates c, w, k, q, and L.
A restaurant sells g gourmet burgers at s dollars each and p plates of pasta at t dollars each, earning L dollars in lunch revenue.
Write an equation that relates g, s, p, t, and L.
A printing press prints 56 posters in 8 minutes.

Write an equation that shows the relationship between x, the number of posters, and m, the minutes of printing.
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