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