Which Equation Does Not Represent Y as a Function of X

question 4

Multiple Choice

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

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Definitions:

Caffeine

A stimulant of the central nervous system present in coffee, tea, and various foods and drinks, known to enhance alertness and reduce fatigue.

Headache

A pain or discomfort in the head, scalp, or neck, often associated with tension, migraine, or sinus issues.

Psychoactive Drug Use

The consumption of substances that have a significant impact on mental processes, affecting mood, perception, and behavior.

Illicit Drug

Substances whose production, sale, or use is prohibited by law, often associated with addictive properties and negative health effects.