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Which relation is a function?

a.
{(5,3), (2,8), (-5, -1),(4,7), (2, 1)}
b. {(5,3), (2,8), (-5,-1), (4,7), (-2, 1)}
{(5,3), (2,8), (-5, -1), (4,7), (5,7)}
d. {(-5,3), (2,8), (-5, -1), (4,7), (
2, 2)}

Which relation is a function? a. {(5,3), (2,8), (-5, -1),(4,7), (2, 1)} b. {(5,3), (2,8), (-5,-1), (4,7), (-2, 1)} {(5,3), (2,8), (-5, -1), (4,7), (5,7)} d-example-1
User Ovadia
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1 Answer

7 votes

Answer: b

Explanation:

You can determine which is a function by looking at the x values. If an x value repeats, it is not a function. In A, the x variable 2 repeats so it is not a function. In C, the x variable 5 repeats. In D, the x variable -5 repeats. The only answer choice where none of the x values are the same is B, so the answer is B. Hope this helps!

User Kiloumap
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