At their family's pizzeria, Jake and Alyssa were folding pizza boxes to get ready for the day. Jake can fold 8 boxes per minute and has already folded 10 boxes. Alyssa can fold 6 boxes per minute and has already folded 20 boxes.

Which system of equations represents the number of boxes (b) that Jake and Alyssa will fold per minute worked (m)?
A.
b = 10m + 8
b = 20m + 6

B.
b = 8m + 10
b = 6m + 20

C.
m = 10b + 8
m = 20b + 6

D.
m = 8b + 10
m = 6b + 20