for a parabola of a quadratic equation then how many straight line can ONLY pass through (a,b) when (a,b) is not the vertex.. can we find out that? i think it should be 1 ( a perpendicular line),

but someone think it might be 2

for a parabola of a quadratic equation then how many straight line can ONLY pass through (a,b) when (a,b) is not the vertex.. can we find out that? i think it should be 1 ( a perpendicular line),

but someone think it might be 2