90 is the answer to this question
If there are 16 cups in one gallon, each gallon u add 16. If you have 3 gallons you add 16 3 times. So to get your answer you multiply 16 by three which is 48 cups.
Answer is (-10,5)
since it lies on the line given it will obviously be in a proportional relationship with the given point (the answer you ticked isn't on the line, check the X and Y axis of the coordinates!)