Answer: y = 32 -1/2x or y= -1/2x +32 one of this could be answers.
Step-by-step explanation:
First you have to convert 2-gallon into cups for you to have the same measurement units.
2 gallons will give you 32 cups.
Now we know that the teacher has 32 two cups and is giving a half of a cup to students.
We could now write the equation as
y = 32 - 1/2x or y= - 1/2x + 32