Question

12x + y= -70
-6x + y=38

Método por determinantes

Answer 1

Respuesta: D = 18      Dx=6      Dy=2

$D=\left[\begin{array}{ccc}12&1\\-6&1\end{array}\right] =(12)*(1)-(-6)*(1) = 12 - (-6)= 18$

$Dx =\left[\begin{array}{ccc}-70&1\\38&1\end{array}\right] =(-70)*(1) -(38)*(1)= (-70)-(38)=-108$

$Dy =\left[\begin{array}{ccc}12&-70\\-6&38\end{array}\right] = (12)*(38) - (-6)*(-70) =  456 - 420 = 36$

Dx = 108/18 = 6

Dy = 36/18 = 2