Answer:
y=4.25x+7.50
Explanation:
3 times 2.50 = 7.50
cost of all the candy Roman is buying ^
you don't know how many bags of popcorn he's buying
y=4.25x+7.50
4.25 is the cost of each popcorn bag, x is how many boxes he will buy
y is the total price he pays
7.50 is the cost of the candy