The number of gallons of water, y , in a tank after x hours may be modeled by the linear equation y = 800 - 50x . Which of the following statements about the tank is true?

It is filling at a rate of 50 gallons per hour.

It is emptying at a rate of 16 gallons per hour.

It is filling at a rate of 800 gallons per hour.

It is emptying at a rate of 800 gallons per hour.

It is emptying at a rate of 50 gallons per hour.

Question

The number of gallons of water, y , in a tank after x hours may be modeled by the linear equation y = 800 - 50x . Which of the following statements about the tank is true? 

It is filling at a rate of 50 gallons per hour.
 
It is emptying at a rate of 16 gallons per hour.
 
It is filling at a rate of 800 gallons per hour.
 
It is emptying at a rate of 800 gallons per hour.
 
It is emptying at a rate of 50 gallons per hour.

nurali · Answer

i think it is emptying at a rate of 50 gallons per hour because, the gradient is negative.