Cramer's rule (Replace column i of A by B; ratio of dets gives x_i when |A|≠0.)
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Replace column i of A by B; ratio of dets gives x_i when |A|≠0.
What each symbol means
| Symbol | What it stands for |
|---|---|
| A_i | A with column i replaced by constant vector |
When to use this
|A|≠0 (unique solution); square system.