Question

questão 9.........................

Answer 1

Resposta:

{ 5x - y = 7

{ x + y = 5

_________

6x + 0 = 12

x =12/6

x = 2

x+y = 5

2 + y = 5

y = 5 - 2

y = 3

S{ 2,3}

{3x - y = 8

{ x +y = 4

________

4x + 0 = 12

x = 12/4

x =3

x+ y = 4

3 + y =4

y =4 -3

y = 1

S={3,1}