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Reflection Matrix (Posted on 2015-04-01) Difficulty: 3 of 5
⌈1  0⌉⌈x⌉=⌈ x⌉
⌊0 -1⌋⌊y⌋=⌊-y⌋

The above 2x2 matrix reflects a point over the x-axis. (x,y)→(x,-y).

Derive a matrix that will reflect a point over the line y=kx.

No Solution Yet Submitted by Jer    
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re: researched solution | Comment 2 of 3 |
(In reply to researched solution by Charlie)

1.  The problem says "derive", not "look up"
2.  Try doing it directly in terms of k not the angle.  It makes a nice formula.
3.  The partial brackets?  I don't remember how I did them.  I think I found the codes but I may have cut and pasted.

  Posted by Jer on 2015-04-01 21:08:11

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