If you are asked to reflect a shape in the x-axis then the x-axis is acting as the mirror line. Also if you are asked to reflect a shape in the y -- axis the
Reflecting a Shape in the X-Axis Using Cartesian Coordinates (Key
Reflecting figures in coordinate space — Krista King Math
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LESSON Graph the line x=-1 then REFLECT across it
Mirror lines can be placed anywhere you just reflect
Transformation Worksheets
Reflecting on a Coordinate Plane Worksheet Download
Reflection Across the x-axis and y-axis (Part 1)
Rules of Rotation - Geometry Review (Video)