[1 1 1 1] [1 1 1 1]
[1 2 3 4] = [0 1 2 3]
[1 3 5 10] [0 0 0 1]

sorry for the lack of proper usage of brackets, its a 3 x 4 matrix.. I know how to do this, I think.. You take your Identity matrix and do what you want to it to get the matrix on the right.. But, is there a 3 x 4 id matrix? Can someone please help and explain it to me a bit better?

Thanks