An Equation of the Form $y ^ { 2 } = 4 p x$

Multiple Choice

An equation of the form $y ^ { 2 } = 4 p x$ is given. Write equations for the directrix and axis of symmetry.
- $$y ^ { 2 } = - 7 x$$

A) directrix: $x = - \frac { 7 } { 4 } ;$ axis of symmetry: $y = 0$
B) directrix: $x = - \frac { 7 } { 4 } ;$ axis of symmetry: $x = 0$
C) directrix: $x = \frac { 7 } { 4 }$ ; axis of symmetry: $x = 0$
D) directrix: $x = \frac { 7 } { 4 }$ ; axis of symmetry: $y = 0$