Answer:
The system of equations is equal to
The number of adult tickets sold is 
The number of student tickets sold is 
Step-by-step explanation:
Let
c------> the number of student tickets sold
a-----> the number of adult tickets sold
we know that
-----> equation A
-----> equation B
Using a graphing tool
The solution of the system of equations is the intersection point both graphs
see the attached figure
The intersection point is 
therefore
the solution is
the number of adult tickets sold is 
the number of student tickets sold is 