Answer:
Top row: yes, no, no
Middle row: no, no, yes
Bottom row: yes, yes, yes
Explanation:
Top row:
Use the vertical line test. If you take your pencil vertically on the paper and moved it from left to right, would there every be two or more points under your pencil? If yes, it is not a function.
Middle row:
Every input has only 1 out put.
Left side: input 0 has two out puts (2 and 3). To be a function it must have only one out put.
Middle: Use the vertical line test
Right side: Each input has only one out put. It does not matter that each output has more than one input.
Bottom row:
Each input has only one out put