The focus is at .
Directrix of the line is .
Since the directrix of the line is then the parabola is vertical.
Standard form of the vertical parabola is , where
is vertex.
If then the parabola opens to the left and
parabola opens to the right.
Directrix is and focus at
.
\
Focus .
\
Directrix
Solve the equations and
:
Therefore, the vertex of the parabola is .
Find the value of .
Substitute in equation
.
Substitute the values and
in standard form.
Therefore the parabola equation is .
Latus rectum is the line segment of a parabola perpendicular to axis which has both ends on the curve.
\The parabola equation is .
Obtain the points define the latus rectum, consider the coordinate of focus as
.
The latus rectum points and
.
Graph :
\(1) Draw the coordinate plane.
\(2) Graph the parabola equation .
(3) Plot the vertex, focus, and the two points and
.
(4) Draw the directrix line.
\(5) Connect the plotted points with smooth curve.
\The parabola equation is .
The latus rectum points and
.
Graph of the parabola is
\.