Identify the relation that is also a function.
a. {(0, -1) (1, -2) (2, -3) (-1, 2)}
b. {(1, 0) (2, 3) (3, -1) (1, 5)}
c. {(4, 2) (4, -3) (9, 3) (9, -3)}
d. {(5, 4) (5, 1) (5, 3) (0, 5)}

A is a function; B, C and D are not.

Step-by-step explanation:

In other words:  Identify the sole function among these relationships.

A function maps any input onto exactly one output.

If a relationship maps any input onto more than one output, it is not a function.

Thus, we eliminate B, C and D.  In B, for example, we have the inputs {1, 2, 3}, where the '1' has two y-values associated with it.

On the other hand, A has the domain {-1, 0, 1, 2}, and all four inputs have exactly one associated output.

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step-by-step explanation: