SOLUTION: Which of the following relations is a function? A.{ (1, 2),  (1, 3),  (2, 8),  (3, 9) } B.{ (1, 2),  (2, 3),  (3, 4),  (4, 5) }

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Question 888761: Which of the following relations is a function? A.{ (1, 2),  (1, 3),  (2, 8),  (3, 9) } B.{ (1, 2),  (2, 3),  (3, 4),  (4, 5) } C.{ (3, -1),  (2, 3),  (3, 4),  (1, 7) } D.{ (3, 0),  (4, -3),  (6, 7),  (4, 4) }
Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!
A.{ (1, 2), (1, 3), (2,8), (3, 9) }

Not a function since x = 1 maps to y = 2, y = 3
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B.{ (1, 2), (2, 3), (3, 4), (4, 5) }

This is a function since every x maps to exactly one y value.
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C.{ (3, -1), (2, 3), (3, 4), (1, 7) }

Not a function since x = 3 maps to y = -1, y = 4
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D.{ (3, 0), (4, -3), (6, 7), (4, 4) }

Not a function since x = 4 maps to y = -3, y = 4

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