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?

Question

anonymous · Answer

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, and complete each step below. If you need help, follow these instructions for using GeoGebra.

alekos · Answer

If the y- value of the vertex is 4 and the directrix is 6 units below this, then what do you think the equation of the directrix will be