When jack went to the movie he paid $8 for his popcorn and $4 for each additional order of popcorn. if y represents the total cost and x represents the number of popcorn orders, what is the function rule that describes this pattern?

a. y = 4(x – 1) + 8
b. y = 4(x – 1) – 8
c. y = –4(x + 1) + 8
d. y = –4(x + 1) – 8