The vertex form of the equation of a vertical parabola is given by y = 1/4p (x-h)^2 + k, where (h, k) is the vertex of the parabola and the absolute value of p is the distance from the vertex to the focus, which is also the distance from the vertex to the directrix. You will use the GeoGebra
geometry tool to create a vertical parabola and write the vertex form of its equation. Open GeoGebra C, and complete each step below. If you
need help, follow these instructions for using GeoGebra.
Part A
Mark the focus of the parabola you are going to create at F(6,4). Draw a horizontal line that is 6 units below the focus. This line will be the directrix
of your parabola. What is the equation of the line?