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
Reflection transformations, Transformation geometry
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Examples on how to reflect a shape in the x-axis or y-axis on a coordinate grid. - HubPages
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4.3 A) Reflection: Undertaking – Part 1 – Transformations – Edexcel GCSE Maths Higher - Elevise
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Reflecting shapes (article), Reflections
Reflection transformations, Transformation geometry
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