РЕШИТЕ СИСТЕМУ УРАВНЕНИЙ 7 КЛАСС
[tex] \left \{ {{3x-5y=14} \atop {x+2y=1}} \right. [/tex]
[tex] \left \{ {{3x-5y=14} \atop {x+2y=1}} \right. [/tex]
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Answers & Comments
х+2у=1
х=1-2у
подставляем в первое:
3х-5у=14
3(1-2у)-5у=14
3-6у-5у=14
-11у=11
у=-11/11=-1
х=1-2у=1-2*(-1)=1+2=3
отв:(3;-1)