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Question 379387: Explain why the vertical line test is used to determine if a graph represents a function?
Answer by richard1234(7193)   (Show Source):
You can put this solution on YOUR website! A relation is considered a function if every x-value maps to at most one y-value. For example, the equation y = sin(x) is a function, but x^2 + y^2 = 1 is not, since a vertical line at x equals, say, 0, would pass through two of the points. For a relation to be a function, any vertical line drawn must not cross more than one point on the domain/range.
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