Johanna bought 13 items at the college bookstore. The items cost a total of ​$30.50. The pens cost ​$0.50 ​each, the notebooks were ​4.00$ ​each, and the highlighters cost ​$1.50 each. She bought 3 more notebooks than highlighters. How many of each item did she​ buy?
Use a system of three linear equations to solve the problem.