Which relations are functions?

x

y

-2

-4

-2 - 6

0

-8

2

-10

x

y

0

4

10 5

20

6

10

7

x

y

2

-10

1 - 20

0

-10

-1

-20

x

y

2.5

0

3.5 4

4.5

8

6.5

12

x

y

-10

4

-20 5

0

6

-10

7

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