RT Journal Article SR Electronic A1 MACUROVÁ, Anna A1 MACURA, Dušan T1 JF Trends in education YR 2009 VO 2 IS 1 SP 489 OP 492 UL https://tvv-journal.upol.cz/artkey/tvv-200901-0112.php AB In the paper are the graphic representations of the solutions some differential equations first order. Graphs are constructed by using DERIVE.