Practice problem
Find the coordinates of △\bigtriangleup△ABCABCABC after a reflection across the line y=−xy=-xy=−x.
[−421−1−32]\begin{bmatrix}-4&2&1\\-1&-3&2\end{bmatrix}[−4−12−312]
[4−2−113−2]\begin{bmatrix}4&-2&-1\\1&3&-2\end{bmatrix}[41−23−1−2]
[−1−324−2−1]\begin{bmatrix}-1&-3&2\\4&-2&-1\end{bmatrix}[−14−3−22−1]
[13−2−421]\begin{bmatrix}1&3&-2\\-4&2&1\end{bmatrix}[1−432−21]
Type a concept, like “slope” or “photosynthesis”.
