# SOLUTION: Can you explain how a graph shows whether relations are functions or not functions? I get confused when using the vertical-line test.

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 Algebra: Functions, Domain, NOT graphing Solvers Lessons Answers archive Quiz In Depth

 Question 82994: Can you explain how a graph shows whether relations are functions or not functions? I get confused when using the vertical-line test.Answer by stanbon(57307)   (Show Source): You can put this solution on YOUR website!If any vertical line intersects the graph more that once the relation is not a function. Why? Because that would imply that for some value of "x" there is more than one corresponding "y" value. That contrdicts the definition of a function. ============= Cheers, Stan H.