What is the relationship between angels a and b

Which of the following transformations does not preserve congruence? * 5 points a. (x, y) → (y − 3, x − 3) b. (x, y) → (x + 5, y − 1) c. (x, y) → (y + 9, −x + 2) d. (x, y) → (3x + 1, 3y − 2)

Plz will give brainliest

Ateacher noticed 5/8 of the students were wearing either blue shorts or white shorts. write two different ways this could be done.