Question

Questão de matrizes, Calcule x, y e z, tais que:

Answer 1

2x-1=3
2x=3+1
2x=4
x=2

z-7=2z
2z-z=-7
z=-7

x-y-7=4
2-y-7=4
-y-5=4
y=-5-4
y=-9

Answer 2

$\left[\begin{array}{ccc}2x&z\\x-y&1\end{array}\right] - \left[\begin{array}{ccc}1&7\\7&1\end{array}\right] = \left[\begin{array}{ccc}3&2z\\4&0\end{array}\right]:$
Basta igualar as equações acima dessa forma:
I)
2x-1 = 3
2x = 4
x = 2
II)
z-7 = 2z
z = -7
III)
(x-y) -7 = 4
(2-y)-7 = 4
2-y = 11
y = -9

Espero que tenha entendido, abraço!