I have matrix A which is
\begin{bmatrix} a & b & c \\ d & e & f \\ g & h & i \\ \end{bmatrix}
with a determinant of -4; and matrix B which is
\begin{bmatrix} -9d & 8e & f-6d \\ -9a & 8b & c-6a \\ -9g & 8h & i-6g \\ \end{bmatrix}
Now, B can be reduced to A by; dividing Column 1 by -9, dividing column 2 by 8, swapping rows 1 and 2 but then I am not sure what to do with column 3 to get it by itself
Then I understand I would multiply all the coefficients together with the determinant to find the determinant of B;
so -4x-9x8x? = det B