
Arturo O. answered 09/28/17
Tutor
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Experienced Physics Teacher for Physics Tutoring
I will set this up for you and you crunch out the numbers.
(1)
AB = C
A-1AB = A-1C
B = A-1C
Since det(A) ≠ 0, A-1 exists. You should be able to find the inverse of a 2x2 matrix and finish the solution from here.
(2)
DA = C
DAA-1 = CA-1
D = CA-1
You should be able to finish from here.