Intra-subject relations as a basis for the successful use of the properties of elementary functions for solving equations and inequalities

The article considers a theoretical approach to formation of intra-subject relations and ways of implementation of this approach in mathematics teaching at school. The author discusses a problem of disconnection of the mathematics learning, which can be solved by application of the intra-subject connections. Such a possibility is shown on the example of associated learning of the functional-graphical line and the line of equations and inequalities.