Question 1197773: {(6, -6), (2, 2), (0, 8), (5, 2), (-5, 2)}
Is the relation a function?
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{(8, -8), (-4, -8), (7, -1), (-7, -1)}
Is the relation a function?
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{(-24, -141), (-9, -141), (133, -83), (-21, -83), (-9, -141), (133, -138)}
Is the relation a function?
Found 2 solutions by josgarithmetic, math_tutor2020:
Answer by josgarithmetic(39617)   (Show Source):
Answer by math_tutor2020(3817) (Show Source):
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Answers:- Yes it's a function
- Yes it's a function
- No, it's not a function
Explanation:- We have a function since none of the x coordinates repeat themselves. Each x input leads to exactly one output.
- Similar reasoning as problem 1.
- The input x = 133 repeats itself. The input x = 133 leads to more than one output (y = -83 and y = -138). This is why we don't have a function. You can toss out or ignore the duplicate copy of (-9, -141)
As a visual alternative, you can use the vertical line test to see if you have a function or not.
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