Determining Non-Function Graphs Using the Vertical Line Test

The video tutorial discusses how to determine if a graph represents a function using the vertical line test. The instructor explains that a graph is not a function if a vertical line intersects it at more than one point. The tutorial includes an analysis of four graphs, identifying which one does not pass the vertical line test, thus not being a function. The lesson concludes with a summary of the key points covered.

What new insight or understanding did you gain from this video?