Since the directrix is horizontal, use the equation of a parabola that opens left or right.

The distance from the focus to the vertex and from the vertex to the directrix is . Subtract the value of the directrix from the coordinate of the vertex to find .

Subtract from .

Substitute in the known values for the variables into the equation .

Simplify.

Find the Parabola with Vertex (4,3) and Directrix x=6 (4,3) x=6