I don't understand how to do this, someone help! I need to graph the points. This is the question: The drama club is selling tickets to their play to raise money for the show's expenses. Each student ticket sells for $4 and each adult ticket sells for $8. There was a total of $640 in revenue from the sale of 100 total tickets. Graphically solve a system of equations in order to determine the number of student tickets sold, (x), and the number of adult tickets sold, (y).