Watch the video on “Using Function Notation” and answer:

1. What is the way of writing ”y” in function notation?
2. What is the reason for this type of notation?
3. If, for example, x = 5 , how do we write “y” in function notation?
4. Write in function notation and solve:
   • y = 3x + 5  ;  x = 2
   • y = x^2 – 4x + 1  ;  x = 3