I hate to nitpick like this, but... The question asked about inverting a 2x2 matrix, nothing about solving a linear system of equations. The latter is certainn

I hate to nitpick like this, but... The question asked about inverting a 2x2 matrix, nothing about solving a linear system of equations. The latter is certainnly one common use of inverting a matrix, sure, but from the problem as given, the use-case could just as well be "report to the end user what the inverse is".