We have that the value of matrix x is is mathematically given as
Option A
From the question we are told
If X-A=B what is X
Matrix
Generally the equation for Matrix is mathematically given as
X=B+A
Therefore
X=B{-9 5; 1 -1}+A{2 -7;6 1}
X={-7 -2;7 0}
Therefore
X={-7 -2;7 0}
Option A
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