The drama club is selling tickets to their play to raise money for the show's expenses. Each student ticket sells for $4.50 and each adult ticket sells for $8. The auditorium can hold a maximum of 150 people. The drama club must make at least $890 from ticket sales to cover the show's costs. Also, they must sell at least 20 student tickets and at least 90 adult tickets. If xx represents the number of student tickets sold and y represents the number of adult tickets sold, write and solve a system of inequalities and determine one possible solution.