Using focus-directrix graph paper, create a parabola that has a horizontal directrix that is six units below the focus. You can get focus-directrix paper on the Lesson 12.1.4 Resource Page available at cpm.org.
You could also use the eTool below to create the parabola. Be sure to read the instructions.
Click the link at the right for the full eTool version: 12-66 HW eTool