we're supposed to write a small program that calculates the intersections of $a(x-1)-by=0$ and $x^2+4y^2=3$. So far that's not such a big deal. I successfully calculate both points for all $b \ne 0$ (since $0=(4\frac{a^2}{b^2}+1)x^2-8\frac{a^2}{b^2}x+4\frac{a^2}{b^2}-3$). But we're also supposed to give the intersection(s) for $b=0$, which is what I have no idea of.
Thanks for any help :)