Reflection over the y=x line

Reflections Across Axes and y = x – GeoGebra

linear algebra - Formula for Reflection about $y=mx$ axis along $y=rac{-x}{m}$. - Mathematics Stack Exchange

HURRY PLEASE!! Which of these could be the transformation? Choose all that are correct. A reflection

E-Portfolio Major – KenJ Faamasunu Geometry

Reflection

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How to reflect a graph through the x-axis, y-axis or Origin? - Interactive Mathematics

Why does taking the inverse of a function reflect its graph across y=x? - Quora

Edgar argues that reflecting the following image over the x -axis and then over the line y = x is the same

Reflections CK-12 Foundation

Reflection Over X & Y Axis, Overview, Equation & Examples - Lesson