Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?
Is the following relationship a function?

Why or why not?