Question

A parabola and its focus are shown on the graph. The vertex of the parabola is at (0,0).

On a coordinate plane, a parabola opens to the right. It has a vertex at (0, 0) and a focus (3, 0).

What is the equation of the directrix of the parabola?

y = 3
y = –3
x = 3
x = –3

Answer 1

Answer: y=-3

Step-by-step explanation: y = -3 Step-by-step explanation: the length to vertex is equal

Answer 2

y = -3

Explanation:

the length from directrix to vertex is equal to the length from focus to the vertex.