So from the question given
Y is the amount of money make for every 10 ticket sold
so x is our variable
since x represent the number of ticket sold
Student B is the one that is correct
y= 1/2x
because y = 1/2 of x
so if they sold 10 tickets
Then y = 1/2 of 10
= 1/2 x 10 = 5
y = $5