Question

Considerando o sistema x+y=1 x-y=2^3

Answer 1

(I)  x + y = 1

(II) x - y = 2³ => x - y = 8

(I)  x = 1 - y

(II) 1 - y - y = 8

(II) -2y = 7

(II) y = -7/2

(I) x = 1 - (-7/2)

(I) x = 1 + 7/2

(i) x = 9/2