molly earns a rebate each month on her movie tickets and books. she earns $0.25 for each movie ticket and $2 for each book. last month molly purchased 4 movie tickets and earned $17.

part a: create an equation that will determine the number of books she purchased.

part b: solve this equation justifying each step with an algebraic property of equality.

part c: how many books did molly purchase last month?
answer asap