y = 4 + 3x
4 being the entrance cost and 3x being the 3 dollars per pound
So when you change the mixed numbers into improper fractions, they become 85/4 and 74/4. Your new problem is 85/4-74/4. Basically 85-74. That equals 9. So the improper fraction answer is 9/4. We now make that back into a mixed number, creating 2 1/4, or A.
Lemme think real quick...
