Question

Jack chooses 15 downloads for $19.75, and jim chooses 40 downloads for $43.50. What is the regristration fee, and what is the cost of each download?

Answer 1

registration fee = x
cost of one download = y

x+15y=19.75
x+40y=43.50

x+15y=19.75
-(x+40y=43.50)
- 25y = 19.75-43.50

-25y = -23.75
y = 0.95

x+15y=19.75
x+15*0.95=19.75
x= 19.75 - 15*0.95
x=5.50

registration fee = $ 5.50
cost of one download = $ 0.95