Avery is draining his pool for the summer season. he needed to determine how long it was going to take to drain his pool and used the equation y = 14,000 -30x where y was the number of gallons left and x was the number of minutes. what is the slope of this model? write a sentence using correct units of measure to interpret the meaning of this number in the context of the problem. what is the y-intercept of this model? write a sentence using correct units of measure to interpret the meaning of this number in the context of the problem.