`-y^2=18x` Graph the equation. Identify the focus, directrix, and axis of symmetry of the parabola.
Let `y^2=4px` be equation of parabola. Then equation of directrix is `x=-p` coordinates of focus are `(p,0)` and axis of symmetry is `x`-axis.
In this case equation of parabola is
Multiply whole equation by `-1.`
Directrix is line `x=9/2` focus is point `(-9/2,0)` and axis pf symmetry is `x`-axis.