абитуриенту
http://basharov.me/msu-math-2013-01/
параметры
http://festival.1september.ru/articles/531229/
http://down.ctege.info/ege/obshee/matem/matem-C5-zadach-s-parametrami-dihtyar.pdf
http://interneturok.ru/ru/school/algebra/11-klass/uravneniya-i-neravenstva-sistemy-uravneniy-i-neravenstv/graficheskiy-metod-v-zadachah-s-parametrom-prodolzhenie-resheniya-zadach
http://salda.ws/video.php?id=J_yVB-IKBhs
http://yourtutor.info/%D1%80%D0%B5%D1%88%D0%B5%D0%BD%D0%B8%D0%B5-%D0%B7%D0%B0%D0%B4%D0%B0%D1%87-%D1%81-%D0%BF%D0%B0%D1%80%D0%B0%D0%BC%D0%B5%D1%82%D1%80%D0%B0%D0%BC%D0%B8-%D0%B8%D0%B7-%D0%B5%D0%B3%D1%8D