Question 149909
See this http://mathworld.wolfram.com/MatrixInverse.html
Find the inverse of 
{{{matrix(2,2, 3,-1, -2,1)}}}

Using the formula in the link above, find {{{1/(ad-bc)}}}
{{{1/(3*(1)- (-2)*(-1))}}}
{{{1}}}

So the inverse matrix is
{{{matrix(2, 2, 1,1, 2,3)}}}

Verify your result by multiplying the given matrix by the inverse and showing the result is the identity matrix 
{{{matrix(2,2, 1,0,0,1)}}}