Question

1 Calcular o valor de x+y+z, sabendo que. A =
2 1 3 - 1 1 - AB = E a
a) 1.
b) 2.
c)3
d)4​

Answer 1

|2 + 1 = 3 2y + 2 = 0 |

| |

| x + 2 = 5 xy + 4 = z |

Resolva as equações.

2y + 2 = 0

2y = - 2

y = - 1

x + 2 = 5

x = 5 - 2

x = 3

xy + 4 = z

(-1).3 + 4 = z

- 3 + 4 = z

1 = z

Logo : x + y + z = 3 - 1 + 1 = 3 (Letra C )