The coefficient matrix is build with its rows representing each equation, and its columns representing each variable.
So, you may write the matrix as
which means
The determinant is computed subtracting diagonals:
So, we have
2.1 + 3.32 – 1.4 = ? A. 6.82 B. 4.02 C. 5.42 D. 4.2
2 answers:
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the answer is y=2x-3
You can look at my work if you really need to
