VALE 10 PONTOS (CONTAS 7 SERIE)quantos é 4(X-5)=3X?

2x - y = 9 x + y = 5 (cancelando o y) - - - - - - - - - 3x = 14 x = 14/3 Substitui numa das equações iniciais: 14/3 + y = 5 y = 5 - 14/3 (para deixarmos o 5 com denominador 3, multiplicamos por 3. Fica 15/3) y = 15/3 - 14/3 y = 1/3 Solução: {14/3 ; 1/3} Se quiser ter certeza, basta substituir o "x" e o "y" nas equações: x + y = 5 14/3 + 1/3 = 5 15/3 = 5 - - - - - - - - - - - - - 2x - y = 9 2 . (14/3) - 1/3 = 9 28/3 - 1/3 = 9 27/3 = 9.

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