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The behavior of solutions of differential equations systems will be more easily interpreted by graphs, but this is not easy drawn without software. As known, mathematics software often requires a complicated programming language to get the desired results. It is not easy for beginners. On the other hand, there is software that is easier to use, especially in drawing a graph. The purpose of this paper is how to utilize GeoGebra as user friendly software to draw a phase portrait of a system of differential equations. Step-by-step drawing phase portrait systems of differential equations both linear and nonlinear will be given. Based on the phase portrait can be seen the behavior of solutions around the equilibrium point.

PEMANFAATAN GEOGEBRA UNTUK MENGGAMBAR POTRET FASE SISTEM PERSAMAAN DIFERENSIAL