Which transformations do not preserve congruence? (Choose 2)

Question

Responses
A (x, y) → (x+2, y–1)( x , y ) → ( x +2, y– 1)
B
(x, y) → ( 1 x, 1 y)
8 8( x , y ) → ( 1 x , 1 y ) 8 8
C (x, y) → (–x, –y)( x , y ) → (– x , – y )
D (x, y) → (x, –y)( x , y ) → ( x , – y )
E (x, y) → (2.5x, 2.5y)( x , y ) → (2.5 x , 2.5 y )
F (x, y) → (y, –x)

Answer 1

C and F do not preserve congruence.