Question

Resolver por qualquer metodo
8 x+y=7
4x + y  =3
      3  

Answer 1

{ 8x+y = 7 ---> y = 7-8x ----(I)
{4x +y/3 =3 
4x+y/3 = 3 ---mmc=3
12x +y = 9 --> y = 9 - 12x --(II)

(I) = (II)
7-8x = 9-12x
-8x+12x= 9 - 7
         4x = 2 ---> x = 2/4 = 1/2

(I) y=7-8x
    y = 7- (8. 1/2)
    y = 7 - 4 ------> y = 3

S={1/2;3)