Algebra-1

Question Analysis
This question tests the understanding of the difference between equations and functions. The key concept is that a function must have a unique output for each input, while an equation like can have multiple outputs for a single input.

Key Concept Explanation
A relation is a function if every vertical line drawn on the coordinate plane intersects the graph at most once (vertical line test).
If any vertical line intersects the graph more than once, the relation is not a function, as it means one input (x-value) corresponds to multiple outputs (y-values).

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