Water begins to drain from a swimming pool at a constant rate of 5 gallons per minute. The amount of water in the
pool can be modeled by the formula x=y-52.
What does the variable z represent in the formula?
O the beginning amount of water in the pool
O the remaining amount of water in the pool
the rate at which water is draining from the pool
the number of minutes since the water began draining from the pool