Any way to solve parametric inequations?

[parisse]

I will probably have to try, but I bet that the TI89 can only solve non linear inequations that can be reduced to linear inequations by factorization. In other words, something that a human can easily do himself once factor has been done. And a symbolic answer won't really help much except in very simple cases (where axis are involved), one needs a graphical representation, that's precisely what I'm coding right now, e.g. session Xcas