Recognizing, understanding, and mastering the relationships of linear functions is the foundation for higher mathematics in all secondary schools. The basic knowledge is conveyed, reinforced, and assessed through worksheets, tests, and learning games. Step by step, the most important elements are explained and practiced in small increments. A continuous progression runs through the worksheets. It is possible to selectively extract individual worksheets for deeper exploration. Additionally, the topic can be comprehensively worked through with this volume. Detailed solutions complete the material. 96 pages, with solutions.