WHICH GRAPHS ARE FUNCTIONS?

THE VERTICAL LINE TEST
 
A graph (or set of points) in the plane is a FUNCTION if no vertical line contains more than one of its points.

[1] Is this graph a function?

[2] Is this graph a function?

[3] Is this graph a function?

[4] Is this graph a function?

[5] Is this graph a function?

[6] Is this graph a function?

[7] Is this graph a function?

[8] Is this graph a function?

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updated 11 February 2000