O90909
Answered

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Sagot :

Answer:

See answers below.

Step-by-step explanation:

A relation is a function if the x-value in group of ordered pairs is only used one time.

1.  Not a function:  The x-value 4 was used twice.

2. Yes, it is a function:  Each x-value was used one time.

3. Not a function:  The x-value -2 was used twice.

4.  Yes, it is a function: Each x-value was used one time.

5.  Not a function: Each x-value -1 and -2 were used twice.

6.  Not a function: The x-value  1/2 was used twice (1/2, 0) and (1/2, 1).

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