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  1. If a vertical line drawn anywhere on the graph of a relation only intersects the graph at one point, then that graph represents a function. If a vertical line can intersect the graph at two or more points, then the graph does not represent a function.
    math.libretexts.org/Courses/Kansas_State_University/Your_Guide_to_Intermediate_Algebra/02%3A_Introduction_to_Functions_and_Graphing/2.03%3A_Understanding_Graphs_of_Functions
    math.libretexts.org/Courses/Kansas_State_University/Your_Guide_to_Intermedi…
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  2. Function and Not a Function – Understanding the …

    Feb 1, 2024 · Learning to differentiate between a function and not a function is an essential skill in mathematics. When teaching this concept, I emphasize that a simple way to identify a function is by using the vertical line test on its graph.

  3. Distinguish Between Function or not a Function - Neurochispas

  4. Not a Function Graph - Understanding Non-functional …

    Feb 1, 2024 · Learn how to use the vertical line test to determine if a graph is a function or not. A graph is not a function if it intersects a vertical line at more than one point. See examples of common toolkit functions and graphs that …

  5. Deciding if a Graph is a Function

    Apr 15, 2020 · What determines if a graph is a function? Look for two points on the graph that have the same x-coordinate, but different y-coordinates. If you …

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