Respostas

  • Usuário do Brainly
2014-08-17T02:29:38-03:00
 \left \{ {{2x+y=6} \atop {3x-y=4}} \right.

regra de Cramer

D= | 2  1 |
     | 3  -1 |

D=2(-1)-3(1)
D=-2-3
D=-5

Dx  | 6  1 |
      | 4 -1 |
Dx=6(-1)-1(4)
Dx=-6-4
Dx=-10

Dy | 2  6  |
     | 3  4  |
Dy=2(4)-3(6)
Dy=8-18
Dy=-10

x=  \frac{Dx}{D} = \frac{-10}{-5} =2

y= \frac{Dy}{D}= \frac{-10}{-5}  =2

S={(2,2)}