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# Quick Matrices Transformatios Q watch

1. Can anybody tell me what transformations these 4 matrices represent please? is there a general rule for these specific transformations (when the 1's are in the top right and bottom left?) I know the general rules for reflection, rotation and enlargement but can't seem to figure out what these ones show.
Thanks.

2. (Original post by Playboy King)
Can anybody tell me what transformations these 4 matrices represent please? is there a general rule for these specific transformations (when the 1's are in the top right and bottom left?) I know the general rules for reflection, rotation and enlargement but can't seem to figure out what these ones show.
Thanks.

Top one is flip in the line x=y,

Second is rotate 90 degrees anti clockwise

Third is rotate 90 degrees clock wise.

4th is flip in line x=-y.

Although considering i haven't looked at my Fp1 book in a month or so i'll say i'm only about 90% sure on those.
3. (Original post by Playboy King)
Can anybody tell me what transformations these 4 matrices represent please? is there a general rule for these specific transformations (when the 1's are in the top right and bottom left?) I know the general rules for reflection, rotation and enlargement but can't seem to figure out what these ones show.
Thanks.

1. Reflection in y = x
2. Rotation 90 degrees positive
3. Rotation 90 degrees negative
4. Reflection in y = -x
4. I got there first but he wrote it up neater/more professionally.

I'm more impressed that i still remember how to do matrices, maybe i won't fail further maths after all.
5. a good method to use is this

plot the identity matrix first, then plot the transformation and see what's going on. it's clear that this is a reflection in the line y = x
6. (Original post by Pheylan)
a good method to use is this

plot the identity matrix first, then plot the transformation and see what's going on. it's clear that this is a reflection in the line y = x
That's the way i do them

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