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The transformation matrix for mirroring a point in x - y plane about the line y = x is given by

1. [1 0] [0 -1]
2. [-1 0] [0 1]
3. [0 1] [1 0]
4. [0 -1] [-1 0]

Correct answer: [0 1] [1 0]

Solution

The correct transformation matrix swaps the x and y coordinates, which reflects points across the line y = x. This effectively mirrors any point in the x-y plane about that line.

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