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The vertical line test is a graphical method used to determine whether a curve represents a function of $x$. A graph represents a function if and only if no vertical line intersects the graph at more than one point.

Conditions: The graph is plotted on a standard Cartesian coordinate system.; The independent variable is $x$.

The vertical line test is a graphical method used to determine whether a curve represents a function of $x$. A graph represents a function if and only if no vertical line intersects the graph at more than one point.

Conditions: The graph is plotted on a standard Cartesian coordinate system.; The independent variable is $x$.