A linear transformation T : R2 → R2 first reflects points through the vertical axis (y-axis) and then reflects points through the line x = y. The standard matrix of T is:
1
\(\left[ {\begin{array}{*{20}{c}} 0&{ - 1}\\ 1&0 \end{array}} \right]\)
2
\(\left[ {\begin{array}{*{20}{c}} { - 1}&0\\ 0&{ - 1} \end{array}} \right]\)
3
\(\left[ {\begin{array}{*{20}{c}} 0&1\\ { - 1}&0 \end{array}} \right]\)
4
\(\left[ {\begin{array}{*{20}{c}} 1&0\\ 0&1 \end{array}} \right]\)
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