Question

x + y = 8
2 x + y = 2

Answer 1

Resposta:

x=-6

y=10

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Answer 2

resolução!

x + y = 8 * (-1)

2x + y = 2

______________

- x - y = - 8

2x + y = 2

x = - 6

y = 8 - x

y = 8 - (-6)

y = 14

S = { X = - 6 e Y = 14 }