Question

Utilizando matrizes,resolva os sistemas a seguir :
A) x+y=7
2x+3y=18

B)3x-y=-1
X+2y=9

C)x+y+z=4
2x+y-z=5
X+2y+2z=7

D)2x+y-3=7
X+2y+3=11
3x-y+23=4

Answer 1

$D \left[\begin{array}{ccc}2&1&-3\\1&2&3\\3&1&23\end{array}\right] D_{= 23} \left[\begin{array}{ccc}7&1&-3\\11&2&3\\4&1&23\end{array}\right] Dx_{= 28} \left[\begin{array}{ccc}2&7&-3\\1&11&3\\3&4&23\end{array}\right] Dy_{=26}$