Brandon has a 55-gallon fish tank. he estimates he can drain the tank at an average rate of 11 gallons per minute. in a linear model of this situation, x represents the number of minutes the tank has been draining. relative to this situation, what does the y-intercept represent?
a. the y-intercept represents the rate at which the tank can be drained.
b. the y-intercept represents the amount of water in the tank before it has been drained.
c. the y-intercept represents the number of minutes it takes to drain the tank.
d. the y-intercept represents the amount of water in the tank after it has been drained.