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  • Sir, I am having some trouble deciding whether some of the graphs are function or not
  • There are many ways to tell if it is a function.
  • Are there any ways that can be done by just looking at the graph?
  • As a matter of fact there is. It is called the vertical line test.
  • what does vertical line have to do with functions?
  • take a vertical line and place it on the graph. If the graph only across the vertical line once, then it is a function.
  • Really? Does that work all of the time?
  • Yes, All of the time.
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