Question

x + y = 9 y = x - 5


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Answer 1

Resposta:

(I)

x + y = 9

(II)

y = x - 5

x - y = 5

Somando (I) com (II):

(x + y) + (x - y) = 9 + 5

2x = 14

x = 14 / 2

x = 7

y = x - 5

y = 7 - 5

y = 2

Portanto:

x = 7

y = 2