SOLUTION: A parabola has its vertex at the origin, and the coordinates of its focus are (0,10). Find the equation of the directrix.

Algebra ->  Quadratic-relations-and-conic-sections -> SOLUTION: A parabola has its vertex at the origin, and the coordinates of its focus are (0,10). Find the equation of the directrix.       Log On


   

Question 863259: A parabola has its vertex at the origin, and the coordinates of its focus are (0,10). Find the equation of the directrix.
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Focus and Directrix, midpoint being the vertex. Now you can figure the distance from the directrix to the vertex. How's that? Simple visualization, and very little thinking, and NO symbolic operations needed.