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ExtremeBDS [4]
3 years ago
5

Is the following relation a function?

Mathematics
2 answers:
rjkz [21]3 years ago
3 0
Because for each x-value in the domain of this relationship, except for 0, there is more than one y-value, this is NOT a function.  
garri49 [273]3 years ago
3 0
Hello!

This relation is not a function. Each input (domain or x value) must have only one output (range or y value). If you look at some of the x values, there are two points where  the relation will intersect the x value. 

For example, on this question (points aren't exact, this is just from perspective) there are points (1,1) and (1,-1). As you can see, this one has two outputs, so it is not a function.

A good way to test to see if a relation is a function is the "vertical line test". You draw (or imagine just to be a quick) a vertical line down towards the graphed relation. This vertical line can only intersect with the graphed relation ONCE. If it intersects with two parts of the relation, it is not a function.

In this scenario, if you drew a vertical line down at x=5, it would intersect with the relation at about 2 and negative 2. Since it intersected twice with the graphed relation, it is not a function.

I hope this helps!
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