The drama club is selling tickets to their play to raise money for the show's expenses. Each student ticket sells for $5 and each adult ticket sells for $10. The auditorium can hold at most 120 people. The drama club must make no less than $810 from ticket sales to cover the show's costs. Also, they can sell a maximum of 30 student tickets and at most 90 adult tickets. If x represents the number of student tickets sold and y represents the number of adult tickets sold, write and solve a system of inequalities graphically and determine one possible solution.