Question

SOCORRO GENTE AAAAAA ​

Answer 1

Resposta:

$A \left[\begin{array}{ccc}1&-2\\0&1\\\end{array}\right] = (1x1)-(-2x0)=1\\  \\B \left[\begin{array}{ccc}4&2\\-1&0\\\end{array}\right] = (4x0)-(2x-1) = +2\\\\\\\left \{ {{2x-y=1} \atop {3x+2y=2}} \right.$

isolando e substituindo temos:

2x - y = 1  ⇒  y = 2x - 1

3x+2(2x-1)=2 ⇒  3x+4x -2=2 ⇒  7x = 4  ⇒ $x=\frac{4}{7}$  

y= 2 $\frac{4}{7}$ -1 ⇒  y = $\frac{8}{7} - 1 = \frac{8}{7}  - \frac{7}{7}  = \frac{1}{7}$