Professor Jacobson is grading papers in the teachers' lounge. He has already finished grading 10 assignments, and is grading 5 more assignments per hour. His teaching assistant just came in to help him. She can grade at a rate of 10 assignments every hour. At some point, they will be finished and will have graded the same number of papers. How many assignments will they each have graded?
Write a system of equations, graph them, and type the solution.