An internet service provider charges $18 per month plus initial set up fee. once customer paid a total of $81 after 2 months of service. what is the initial set up fee and how much does it cost after 5 months of service

18*m +fee = charge

at 2 months  the charge is 81  so substitute in

18*2 +fee = 81

36+fee=81

subtract 36 from both sides

fee = 45

for 5 months what is the charge

18*m +fee = charge

18*5 +45 = charge

90 + 45 = charge

135

the initial fee is $45 and the 5 month fee is $135

u dumb boi

step-by-step explanation: