Jawapan

2016-03-03T14:39:58+08:00
1. It is the line of symmetry of a parabola and divides a parabola into two equal halves that are reflections of each other about the line of symmetry.
2. 
It intersects a parabola at its vertex.
3. 
It is a vertical line with the equation of x = -b/2a.