$4
You can get this by setting up 2 equations. One for you and one for your friend. Each should have a cost equation. Let x = adult and y = student.
You: 7x + 16y = 120
Friend: 13x + 9 = 140
Solve using any method.
Answer:
y = 20x + 25
Step-by-step explanation:
y is the total
25 dollars to start plus the 20 dollars per month