A Model of the Form $y ^ { 2 } = 4 p x$

Multiple Choice

A model of the form $y ^ { 2 } = 4 p x$ is given. Identify the focus, and write an equation for the directrix.
- $$y ^ { 2 } = - 3 x$$

A) focus: $\left( - \frac { 3 } { 4 } , 0 \right)$ ; directrix: $x = \frac { 3 } { 4 }$
B) focus: $\left( 0 , \frac { 3 } { 4 } \right)$ ; directrix: $y = - \frac { 3 } { 4 }$
C) focus: $\left( - \frac { 3 } { 4 } , 0 \right) ;$ directrix: $x = - \frac { 3 } { 4 }$
D) focus: $\left( 0 , - \frac { 3 } { 4 } \right) ;$ directrix: $y = \frac { 3 } { 4 }$