tolong bantuannya dan pembahasan

M × matriks A = matriks B
det (M) × det (matriks A) = det (matriks B)
|M| × |A| = |B|
|M| = |B| / |A|
|M| = [a(-b+d) - b(-a+c)] / (ad - bc)
|M| = (-ab+ad+ab-bc) / (ad-bc)
|M| = (-ab+ab+ad-bc) / (ad-bc)
|M| = (ad-bc) / (ad-bc)
|M| = 1
opsi jawaban A

semoga membantu, mohon dikoreksi bila ada kesalahan