Question

calcule o valor de x e de y usando a regra de Cramer x -y=o x +y=2

Answer 1

x - y = 0
x + y = 2

[1  - 1]
[1    1]

Det = 1.1 - [ - 1.1]
D = 1 - [ - 1]
D = 1 + 1
D = 2

Dx 

[0   - 1]
[2     1]

Dx = 0.1 - [ - 1.2]
Dx = 0 - [ - 2]
Dx = 2

Dy

[1    0]
[1    2]

Dy = 1.2 - [0.1]
Dy = 2 - 0
Dy = 2

x = Dx
      -----
       D

x = 2/2
x = 1

y=   Dy
      -------
        D

y = 2/2
y = 1

Resp.: x = 1 e y = 1

*************************
Prova Real:

x - y = 0
x + y = 2

1 - 1 = 0
1 + 1 = 2