Answer:
Step-by-step explanation:
A point on a line of reflection is reflected to itself. A point P not on a line of reflection is reflected to P' such that the line of reflection is the perpendicular bisector of PP'.
Each point will be reflected to itself if the line of reflection goes through them both. That is, it will be line QR. Both points have y-coordinates of -4, so line QR is ...
y = -4 . . . . . . . . line of reflection mapping Q ⇒ Q and R ⇒ R
Each point will be reflected to the other point if the line of reflection is their perpendicular bisector. We know Q and R lie on a horizontal line, so their perpendicular bisector will be the vertical line at the average of their x-coordinates:
x = (6 +(-2))/2
x = 2 . . . . . . . . line of reflection mapping Q ⇒ R and R ⇒ Q
In the attached, this is designated as line m.
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In the attached image, the two possible lines of reflection are shown as dashed gray lines.