Question

What is the directrix of the following graph?


y = 5

y = -5

x = -5

x = 5

Answer 1

That red straight-line is the directrix for this parabola.
what do you think is it's equation?

Answer 2

A?

Answer 3

thanks!

Answer 4

sorry x=-5

Answer 5

It is an hyperboll and the red line of equation x=-5 is the directrix

Answer 6

@pape - really would help if you could provide an explanation as well, and not just the answer. Thanks :)

Answer 7

actually, it's a parabola.

Answer 8

You can see it that way as parabola