me dun c de link...
Let's call the 1st matrix A and the 2nd matrix B.
Since B is the inverse of A
than AB = I ( where I is the identity matrix)
This should be quite clear unless you have not been taught that a
matrix multiplied by its inverse is the identity matrix.
Sadly, the syllabus between A and E Maths is a little disjointed
in the sense that the above is not specifically in syllabus.
However, the requirement in A Maths is such that you do not really
understand the concept behind how to solve simultaneous
equations by matrix unless you understand the above... you do not
really know the logic behind the matrix solutions.
However both the PenPac and ShingLee textbooks bothered to
explain it, so you should refer to any of these for an explanation
of the concepts and relationship between a matrix, its inverse and
the identity matrix. :)