Respostas

  • Usuário do Brainly
2014-05-29T13:42:55-03:00


 y=(-1+3x)/2         subs.   em 4x+3y=41

  y=(-1+3.5)/2                         4x+3(-1+3x)/2=41      mmc=2

   y=(-1+15 )/2                                  8x-3+9x=82

  y=14/2                                                     17x=85                        S={(5,7)}

  y=7                                                         x=85/17    x=5

2014-05-29T13:44:32-03:00
{(3x - 2y = 16) . 3
{(2x + 3y = 41) . 2

{9x - 6y = 48
{4x + 6y = 82
------------------
13x = 130
x = 130/13
x = 10

2x + 3y = 41
3y = 41 - 2x
3y = 41 - 2 . 10
3y = 41 - 20
3y = 21
y = 21/3
y = 7

Resposta do sistema:
x = 10
y = 7

S = {(10, 7)}