Question 160123
If you find a duplicate x-value, then the different y-values mean that you do not have a function.

Your question:
Determine whether the relation is a function.

{(-6,-3),(-6,-9),(2,-6),(4,4),(8,-3)}

a. function
b. not a function

All x values: -6, -6, 2, 4, 8

All y values: -3, -9, -6, 4, -3


If you notice that there are two points with the same x value of -6.

Point (-6, -3) and point (-6, -9) both have the same -6 value for x.

See it?

When two or more points have the same x value, then there is no function.

The answer is b = not a function.

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