At her track practice, Marcella can run at 2.4 meters per second. She writes the equation y=2.4x to represent how many meters she runs after a certain number of seconds. Which statement is true regarding the variables in the equation y=2.4x? 1. The dependent variable, y, is the number of seconds Marcella runs. The independent variable, x, is the number of meters per second Marcella runs. 2. The dependent variable, y, is the number of meters per second Marcella runs. The independent variable, x, is the number of seconds Marcella runs. 3. The dependent variable, y, is the number of seconds Marcella runs. The independent variable, x, is the number of meters Marcella runs. 4. The dependent variable, y, is the number of meters Marcella runs. The independent variable, x, is the number of seconds Marcella runs.