Eva has an accessories shop where she only sells rings and belts. She sells rings for $30 and belts for $40. It takes 30 minutes to make ring and 1 hour to make a belt, and, since Eva is a CS tutor, she only has 10 hours a week to make the accessories. In addition, she only has enough materials to make 15 total accessories items per week. She makes a profit of $15 on each ring and $20 on each belt. How many rings and belts should Eva make each week in order to maximize her profit, assuming she sells all her accessories? Define the variables, write an inequality for this situation, and graph the solutions to the inequality.