Why it is called a reflection about the y-axis followed by a reflection about the x-axis?
$\endgroup$ 31 Answer
$\begingroup$Think of it this way, which is intuitive. The description is equivalent to say that you fold the plane with respect to the vertical axis and then fold the "half plane" with respect to the horizontal axis; then the north-east graph coincides with the south-west graph.
$\endgroup$
