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||
|
|
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|
2 x + 3 y + 7 z = 2
x - y - z = 1
x + z = 1
The matrix here is (2 3 7).
Its determinant is -1, which is not 0.
|
1 |
-1 |
-1 |
|
1 |
0 |
1 |
Therefore these equations have a unique solution.