Solved with Maple.
I need to find a graph of following function using isocline method:
I've got as far as drawing some parabolas, and directional field over them, but I don't know how to draw the graph itself. So I decided to solve it the other way and got this function:
Which looks like this:
Is this the way it supposed to be? And is there any way to solve differential equations in Wolfram Mathematica or something similiar using isoclines?