Question

Write equation about total terms

Answer 1

Define on variables:
x = # of student tickets sold
y = # of adult tickets sold

Equation about total items:
$x+y=22$

Equation about total price:
$4x+6y = 108$

Solve the system:
$x = 22-y$
$4(22-y)+6y=108$
$88-4y+6y=108$
$88+2y=108$
$2y=20$
$y = 10$

Plug that into the first equation to get:
$x+10=22$
$x = 12$

So, your answer is: 12 student tickets were sold, and 10 adult tickets were sold.