Boa noite. Esse sistema de equações é bem simples de resolver. Note que na primeira temos "y" e na segunda "-y".
Sabemos que eles serão cancelados. Então: 4x - y = 8 x + y = 7 (cancela o y) 5x = 15 x = 15/5 x = 3 Agora substitui o x numa das equações iniciais: 3 + y = 7 y = 7 - 3 y = 4 Solução: {3,4} - - - - - - - - - - - - Para confirmar se a conta está correta, substitua os valores nas equações: 4x - y = 8 4 . 3 - 4 = 8 12 - 4 = 8 x + y = 7 3 + 4 = 7.
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