Mohon tunjukan penyelesaian ini gimna,satu persatu secara detail saya mau belajar,,please

smoga membantu ya ^_^

det A = 3(1) - 4(0) = 3 - 0 = 3 => det (A^-1) = 1/3
det B = 2(2) - 1(-3) = 4 + 3 = 7 => det (B^-1) = 1/7
A^-1 . C = B^-1
det(A^-1) . det(C) = det(B^-1)
1/3 . det(C) = 1/7
det(C) = 1/7 . 3/1 = 3/7