To solve this problem using a graphing calculator, follow these steps:
1. Go to the Desmos Graphing Calculator link provided.
2. In the input area, type the equation for the cost of all adult and student tickets sold: `a + s = 2,820`. This equation represents the total revenue generated from ticket sales, where 'a' represents the number of adult tickets sold and 's' represents the number of student tickets sold. Press Enter or click outside the input area to graph the equation.
3. To represent the equation for the number of tickets sold, use the information given that 900 tickets were sold for the Spring Fling. In the input area, type `a + s = 900`. This equation represents the total number of tickets sold, where 900 is the sum of adult and student tickets. Press Enter or click outside the input area to graph the equation.
4. Now we have a system of equations with two unknowns: `a + s = 2,820` and `a + s = 900`. The next step is to determine the points of intersection, which represent the solution to the system.
5. Look for the points of intersection on the graph. These points represent the combination of adult and student tickets sold that satisfy both equations.
6. In the response area for the number of adult and student tickets sold, input the values of 'a' and 's' at the point of intersection. For example, if the point of intersection is (350, 550), then input '350' in the response area for adult tickets and '550' in the response area for student tickets.