The amount of money, y, that Valentina earns at her job after working x hours is given by the direct variation equation y=12.5x. Identify the constant of proportionality. What does the constant of proportionality represent?
The constant of proportionality in the direct variation equation y = 12.5x is 12.5.
The constant of proportionality represents the rate at which the dependent variable (y) changes with respect to the independent variable (x). In the context of this equation, the constant of proportionality (12.5) represents the amount of money that Valentina earns per hour at her job. Thus, for every hour Valentina works, she earns $12.50.