The volume of air in a person's lungs can be modeled with a periodic function. The graph below represents the volume of air, in mL, in a person's lungs over time t, measured in seconds. Volume of air (in mL) 3000 2500 2000 1500 1000 500 0 1 (1.25, 1000) 3 (3.75, 3100) 6 4 5 Time (in seconds) (6.25, 1000) 7 8 (8.75, 3100) Write an equation in terms of y, volume of air in a person's lungs in mL, and t, time in seconds, to represent the given context.

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