Communication in mathematics supported by information technologies

I deal with possibilities how to apply Information Technologies in teaching of mathematics. I depict a contemporary state of IT use in teaching in European countries. I report the results of an experiment, which goal was to use the Equation Grapher program in teaching of linear and quadratic functions. I state the subsequent hypothesis: Information technologies, or more precisely Equation Grapher, can be effectively used in the phase of exercise and revision of the topic.