I need to find a graph of following function using isocline method:

$\displaystyle y'=y-x^2,$ through M(1,2)

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:

$\displaystyle y=e^{x-1}+x^2+2x-2$

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?