Parabolas. Section 8.3. You have studied parabolas in several different lessons, and you have transformed parabolic graphs to model a variety of situations. Now a locus definition will reveal properties of parabolas that you can use to solve other practical problems.
The directrix can also be neither horizontal nor vertical, creating a parabola that is rotated at an angle.
Consider the parent equation of a horizontally oriented parabola, y2 = x.