Since the directrix is horizontal, use the equation of a parabola that opens left or right.
Find the distance from the focus to the vertex.
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 .
Find the Parabola with Vertex (4,3) and Directrix x=6 (4,3) x=6