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.

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