The table below shows the numbers of tickets sold at a carnival and the amounts of money in dollars collected Cost of Carnival Tickets
 Number of Tickets. Amount $ Collected.
 5 $15 
10. $30 
15. $45 
20. $60 
25. $75 
Which equation represents the relationship 
A y = x + 10
 B y = 5x 
C y = x + 15 
D y = 3x