ex 11 va rog ma grabesc
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Răspuns:
[tex]x + y = 25 \\ \\ 2x + 3y = 65[/tex]
Inmultim cu 2 prima ecuatie:
[tex]2x + 2y = 50[/tex]
Deci, vom inlocui in cea de a doua ecuatie:
[tex]2x + 3y = 65 \\ \\ 2x + 2y + y = 65 \\ \\ 50 + y = 65 \\ \\ y = 65 - 50 \\ \\ y = 15[/tex]
Acum, in prima ecuatie:
[tex]x + y = 25 \\ \\ x + 15 = 25 \\ \\ x = 25 - 15 \\ \\ x = 10[/tex]
Raspuns: x=10; y=15
Succes! ♡︎♥︎♡︎