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Sagot :
It's only A, because for each x, there's only one y, unlike B where there are two values for x=4 and two for x=9.
Answer:
Option A is correct.
only set A is the ordered pairs represents a function.
Step-by-step explanation:
By the definition of a function, for each input there exists a unique output.
In particular, for each value of x there exists unique value of y.
In set A,
we have four ordered pair (1, -2) , (3, -5) , (5, 2) and (7, 5)
For each input value of x in set A, there is a unique value of y in set A.
therefore, Set A is a function.
In set B,
we have four ordered pair (4, 2) , (4, -2), (9, 3) and (9, -3)
which means for x=4 , we have two values of y, i.,e 2 and -2
⇒ for a single value of x , there exist more than one value of y,
therefore set B is not a function
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