can someone explain this please?

Question

Identify whether each graph represents a function. Explain. If the graph dose represent a function is the function linear?

the coordinates are (0,5) (1,0) (2,-3) (3.-4)(5,0) (6,5)

Answer 1

I see two different x's producing the same y value
(1,0) and (5,0).

So you don't have a function.

Answer 2

Thank you!!!