Question

Matrices A and B shown below are equal.

Answer 1

Answer:

-18

Step-by-step explanation:

see attachment for the figure.

If the two matrices are equal.  In this way, the amount in the upper, right-hand corner of A (which is - 18) is equivalent to the amount in the upper, right-hand corner of B, which is b₁₂

Therefore, the first answer choice (-18) is the correct one.