CSEC Mathematics · January 2011 · Paper 1 · Question Q58

In the diagram above, if the line y = x is rotated anti-clockwise about O through 90^\circ, what is its image?

1. (A)y = 0
2. (B)x = 0
3. (C)y = x
4. (D)y = -x

This question uses a figure or table from the paper — you'll see it when you practise.