!!! PLEASE HELP FAST !!!!

The school that Nicole goes to is selling tickets to a play. On the first day of
ticket sales the school sold 7 adult tickets and 5 student tickets for a total of
$105. The school took in $84 on the second day by selling 7 adult tickets and 2
student tickets. What is the price each of one adult ticket and one student
ticket?
A) adult ticket: $7, student ticket: $10
C) adult ticket: $11, student ticket: $6
B) adult ticket: $5, student ticket: $10
D) adult ticket: $10, student ticket: $7