Respuesta :
A = 40 + 20x
B = 30x
These answers would just be the equations because Plan B would eventually catch up to Plan A so Plan B is the best option.
m = fee per month for usage
y = total cost/payment
Plan A
y = 20m + 40 (you buy the phone for $40, which is a one time purchase, and have to pay $20 each month)
Plan B
y = 30m (only have to pay $30 each month)