Find the equation of the directrix of the conic. 
Definitions:
Political Balance
The concept of maintaining equilibrium among various political forces or interests within a society or institution.
Single-Member Plurality System
An electoral system in which candidates compete for a single representative seat from an electoral district, and the candidate receiving the most votes wins.
Proportional Representation System
An electoral arrangement that translates the number of votes received by political parties into a proportionate number of seats in the legislative body.
Winner-Take-All System
A winner-take-all system is an electoral system in which the candidate receiving the most votes wins the office or prize in question, with no rewards for those who finish second or lower.
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