NK Karate Club offers two different fees for their karate classes. Club members are charged a one-time membership fee of $32 and pay $4 per class. Non-members pay $8 per class. Let y represent the number of karate classes attended.
a. Write an expression to represent the cost for a non-member to attend y classes.

b. Write an expression to represent the cost for a member to attend y classes.

c. Set the two expressions equal to each other and solve the equation to determine how many classes result in the same cost for a member and non-member.