Question

Point D' is the image of D(-2, 1) under a reflection
across the x-axis.

Answer 1

D' (- 2, - 1 )

Explanation:

Under a reflection in the x- axis

a point (x, y ) → (x, - y ) , then

D (- 2, 1 ) → D' (- 2, - 1 )

Answer 2

2-1 feflect like your math teacher told you