it works after i delete the constraints A == B ; // previously from your quadratic equation.


i think i need to think about a input system of (xp,yp) and  (xp1,yp1) and from there calculate the display.

having some problem displaying x = 0 , x = -3 etc.

i think it is a bit harder than simply downgrading from a quadratic equation display.

need to think more!!