Answer:
[tex]\left[\begin{array}{ccc}-48&-60\\44&30\end{array}\right][/tex]
Step-by-step explanation:
0.5 X + 3A = B implies
X = 2(B-3A)
3A simply means multiplying each cell by 3
[tex]3A = \left[\begin{array}{ccc}12&24\\-33&-3\end{array}\right][/tex]
B-3A is a corresponding cell by cell subtraction
[tex]B-3A = \left[\begin{array}{ccc}-24&-30\\22&15\end{array}\right][/tex]
Finally multiply that by 2, result is at the top.
