| Homework.
 Theoretical material:The simplest problem of analytic geometry. Equations of a straight line on a plane. Vectors. Solve problems: 1. Calculate  2. Find АВС, if:  3. Prove, that  4. Solve systems of linear equations matrix method by matrix method and by Cramer’s formula: a.  5. Investigate systems on compatibility and, in case of compatibility, solve them by Gauss's method:  
 
 
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