Long description
Finding x. A 3 by 3 matrix is formed using the values corresponding to the variables in the equation. First column consists of the constants. negative 1, 11 and 9. Column 2 has the variable values. 2, negative 3 and negative 2. Column 3 also has the variable values. Negative 5, negative 1 and 7. The matrix has 2 columns besides, which are 1, 11, 9, and 2, negative 3 and negative 2. These are divided by a 3 by 3 matrix of column values 3, 2, 5. 2 negative 3, negative 2 and negative 5, negative 1 and 7. The matrix has 2 columns besides, which are 3, 2, 5 and 2, negative 3 and negative 2. This = start fraction 21 minus 18 + 110 minus 135 + 2 minus 154 whole divided by negative 63 minus 10 + 20 minus 75 minus 6 minus 28 end fraction ...
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