Difference between revisions of "Vertical line test"
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For example, <math>y=x^2</math> is a function because any vertical line intersects it in, at most, one point, while <math>x^2+y^2=1</math> is not a function (try the line <math>x=0</math>). | For example, <math>y=x^2</math> is a function because any vertical line intersects it in, at most, one point, while <math>x^2+y^2=1</math> is not a function (try the line <math>x=0</math>). | ||
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| + | In other words, for every x value, there should only be one y value. | ||
{{stub}} | {{stub}} | ||
Revision as of 23:33, 24 May 2016
The vertical line test is a way of determining whether or not a plotted graph is a function.
The vertical line test states that a relation is a function iff no vertical line intersects the graph in more than one point.
This is because a function cannot have more than one output for any one input.
For example, 
is a function because any vertical line intersects it in, at most, one point, while 
is not a function (try the line 
).
In other words, for every x value, there should only be one y value.
This article is a stub. Help us out by expanding it.
