Difference between revisions of "Vertical line test"
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The '''vertical line test''' is a way of determining whether or not a plotted [[graph of a function|graph]] is a [[function]]. | The '''vertical line test''' is a way of determining whether or not a plotted [[graph of a function|graph]] is a [[function]]. | ||
| − | The vertical line test states that a [[relation]] is a [[function]] [[ | + | The vertical line test states that a [[relation]] is a [[function]] [[if]] 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. | This is because a function cannot have more than one output for any one input. | ||
Revision as of 15:43, 5 July 2018
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 if 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.
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