Respondido

Sejam x e y coordenadas do ponto de encontro entre as retas de equacoes : - 2x+y =- 1ex+y=2 , determine x + y

Resposta :

CTSOUZASILVAGO

Resposta:

x + y = 2

Explicação passo-a-passo:

[tex]\left \{ {{2x~+~y~=~-1} \atop {x~+~y~=~2}} \right.\\\\\left \{ {{2x~+~y~=~-1} \atop {-x~-y~=~~-2}} \right. \\\\x~=~-3\\\\x~+~y~=2\\\\-3~+~y~=~2\\\\y~=2+3\\\\y=5\\\\x+y=-3+5\\\\x+y=2[/tex]

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