Question

7x - 4y = 22
12x - 4y = - 8 pf me ajude​

Answer 1

Resposta:

{7x-4y=22

{2x-4y=-8

7x-4y=22.(-1)

{-7x+4y=-22

{2x-4y=-8

-5x=-30.(-1)

5x=30

x=30/5

x=6

2x-4y=-8

2.6-4y=-8

12-4y=-8

-4y=-8-12

-4y=-20.(-1)

4y=20

y=20/4

y=5

S={6, 5}

Explicação: