Find all numbers that are NOT in the domain of the function

[Panama]

f (y) = y/y-4

1) List any numbers that should be EXCLUDED from the domain.
2) The domain of the function in set notation is {y/__} ????

 

[fasteddie65]

"f (y) = y/y-4

1) List any numbers that should be EXCLUDED from the domain."

The number 4 must be excluded.

"2) The domain of the function in set notation is {y/__} ????"

{y/y ? 4}