Question

Resolva o sistema usando a Regra de cremer

{x -2y = - 1
x -y = -1

Answer 1

| 1 -2 |
| 1 .-1 |

D = -1 + 2
D = 1

| -1 -2|
| -1 -1|

Dx = 1 - 2
Dx = -1

| 1 -1 |
| 1 -1 |

Dy = -1 + 1
Dy = 0



X = Dx/D
Y = Dy/D



X = -1/1
X = -1

Y = 0/1
Y = 0


S={ -1, 0 }