Which Equation Does Not Represent $y$ As a Function Of $x$ ?
A)

Multiple Choice

Which equation does not represent $y$ as a function of $x$ ?

A) $x = 6 y - 9$
B) $x = - 5$
C) $y = x + 5$
D) $y = \left| - 1 - x ^ { 2 } \right|$
E) $y = \sqrt { - 5 + 4 x }$