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PLEASE HELP ME!! I really need the help with this question!!

PLEASE HELP ME!! I really need the help with this question!!-example-1
User MJK
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1 Answer

24 votes
24 votes
1st graph

A simple way to test if a relation may be taken as a function is by applying the Vertical Line Test. If a Vertical Line crosses the graph only once, then it is a function. In this question, only the first one can be considered to be a function.
Because in other words, only the first graph shows one value for x corresponding to another for y value. Not the case for the second and the third graph displaying two values for x for each y value.

User Giovanni Benussi
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