In the junior school math program, students understand the concept of graph y=f(x) as simply a collection of points representing pairs of numbers (x; y) in the coordinate plane without mentioning the value of which set does x belong to? In current Math 10, the concept of a graph of a function y= f(x) is a set of points with coordinates (x; f(x)) but x must belong to the domain of the function. To clarify the concept of function graphs according to the current Grade 10 Math program, we propose a way to design situation for teaching graph concepts with the support of GeoGebra software