Answer
Fill the blanks with
$6,\ -1,\ -1,\ 12$
Work Step by Step
Subtracting a matrix B adding its additive inverse, -B.
To add two matrices of the same dimension, add corresponding elements.
Two matrices are equal if they have the same dimension and if corresponding elements, position by position, are equal.
---
Subtracting the matrices on the LHS, we have
$\left[\begin{array}{ll}
6 & -1\\
-1 & 12
\end{array}\right]=\left[\begin{array}{ll}
w & x\\
y & z
\end{array}\right]$
Position by position,
$w=6, x=-1, y=-1, z=12.$
Fill the blanks with
$6,\ -1,\ -1,\ 12$
