Question

@Mertsj do you know how to solve this?

Answer 1

if you make the subject of the formula, you get
\[X=\left[\begin{matrix}6 & -7 \\ 1 & 4\end{matrix}\right]-\left[\begin{matrix}0 & 4 \\ 9 & 5\end{matrix}\right]\]

Answer 2

do you understand what i have done??

Answer 3

All you have to do is to remember that you subtract matrices by subtracting the individual entries. So if you have an entry of 6 in the left matrix and end up with 0 in the matrix on the right, it is because you subtracted 6. Therefore the first entry in the matrix X must be 6