Question

Regra de Cramer
$\binom{3x + y = - 4}{2x + 5y = 6}$

Answer 1

D

$\left[\begin{array}{ccc}3&1\\2&5\end{array}\right]$

3 * 5 - (2 * 1)

15 -2

13

Dx

$\left[\begin{array}{ccc}-4&1\\6&5\end{array}\right]$

-4 * 5 - (6 * 1)

-20 -6

-26

x = Dx/D

x = -26/13

x = -2

Se x = 2 em (I)

-2 * 3 + y = -4

y = -4 + 6

y = 2

{-2 , 2}