Question

O valor de z do sistema de equações, é:

Answer 1

$\left[\begin{array}{cccc}1&-2&-2&-1\\1&-1&1&-2\\2&1&3&1\end{array}\right] =\left[\begin{array}{ccc}1&3&-1\\5&7&3\\\end{array}\right] -> -8z=8$

-z = 1

z = -1