Question

Teachers say writing in an essay “ You and Your “ is informal.

I always write them so lesson learned. What are other ways to say “you and your” that is formal?

Answer 1

Your teacher is saying that talking in 2nd person is informal. Which for academic writing, it is. Try changing it to 3rd person. Refer to the person as the reader, or as "one".

For example:

2nd Person:

You might say your favorite color is blue.

3rd Person:

One might say their favorite color is blue.

Hope this helps!