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metoda reduceri a stemelor de ecuatii {x+y =5si x-y =1​

Răspuns :

[tex]\it\ \begin{cases}\it x+y=5\\ \\ \it x-y=1\end{cases}\\ ------\\. \ \ 2x\ \ \ \ \ =6 \Rightarrow x=3\ \ \ \ (*)\\ \\ x+y=5\stackrel{(*)}{\Longrightarrow}\ 3+y=5 \Rightarrow y=2\\ \\ S=\{(3,\ \ 2)\}[/tex]