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Ah, using elementary transformations is method 1.

yes I know

For two by two matrix, there is a shortcut method to determine the inverse of the matrix..

Oh no, that is just a trick to find the inverse in a jiffy..

Why R2/7?

7-15/2 = -1/2

i got it ! thanks! :)

yeah!

Which obviusly simplifies a little... hehe.. -7

is there any shortcut in this elementary method?

hmm..okay! its more or less like Rubik's cube. :/