⎡1 2⎤⎡c a⎤ ₌ ⎡8a 4⎤ _ ⎡a –6⎤
⎣–2 3⎦⎣3c 2a⎦ ⎣16b 9⎦ ⎣2b 5c⎦
yakni …
Pembahasan:
⎡7c 5a⎤ ₌ ⎡7a 10⎤
⎣7c 4a⎦ ⎣14b 4c⎦
5a = 10 ⇒ a = 2
4a = 4c ⇒ a = c = 2
7c = 14b ⇒ 7.2 = 14b ⇒ b = 1
Makara, a + b + c = 2 + 1 + 2 = 5