Use the conditional probability formula, P(a|b) = P(a and b)/P(b)
Well, first you must divide the amount of gallons by the amount of people.
2/9 = 2/9 gallons which would be about 3.5 cups.
(Personally I would do 2/9 cups)
2x+12 would be the answer
the slope is -6/5. This is because it goes down 6, and then to the right for 5. You can also use the slope formula to solve this.
