Respuesta :
Answer: The y-axis
Step-by-step explanation:
(x,y) -> (-x,y)
(3,1) -> (-3,1)
Answer: the y-axis
When the point was reflected across a line, another way to explain it is that it was reflected over the midpoint of the line formed by the original point D and D'. The midpoint of DD' is (0, 1). The definition of the y-axis is all points in the form (0, y) where y is any real number. Thus, (0, 1) was on the y-axis, and D' is formed by reflecting D over the y-axis.
