Originally Posted by

**dellatorre** Looking for help with a problem I'm working on:

"Show that matrix

[0 -1 0]

[-1 0 0]

[0 0 1]

for a reflection about line y=-x

is equivalent to a reflection relative to the y axis followed by a counter-clockwise rotation of 90 degrees."

So for my answer, first I have for the reflection relative to the y axis, I have the matrix:

[-1 0 0]

[0 1 0]

[0 0 1]

and for the counter-clockwise rotation of 90 degrees, I have the matrix:

[0 -1 0]

[1 0 0]

[0 0 1]

but then I don't know what my next step should be.

Can anyone help me with this?

thanks,

Della