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Question 1090545: 1) what are the coordinates of the reflections of the point (2,-7) about the line y=-4
Answer by MathLover1(20850)   (Show Source):
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what are the coordinates of the reflections of the point (2,-7) about the line y=-4
Coordinate Rules for Reflection
If (a, b) is reflected on the x-axis, its image is the point (a, -b)
If (a, b) is reflected on the y-axis, its image is the point (-a, b)
If (a, b) is reflected on the line y = x, its image is the point (b, a)
If (a, b) is reflected on the line y = -x, its image is the point (-b, a)
 is the equation of a horizontal line at  (the mirror line or the line of reflection ), parallel to x-axis
point ( ,  ) has an  that is  in  from the line of reflection but on the  side
The distance between (, ) and  , is  units in the "y" direction.
The first reflection of (, ) about then is units  given line of reflection, at (,  )
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