Question

6.quais os valores de x e y na igualdade abaixo?
[1 4] = [1 (x-1)]
[5 9] [5 y2]​

Answer 1

$\left[\begin{array}{cc}1&4\\5&9\end{array}\right] =\left[\begin{array}{cc}1&x-1\\5&y^2\end{array}\right]$

$4=x-1\Longrightarrow x=4+1\ \therefore\ \boxed{x=5}$

$9=y^2\Longrightarrow y=\pm\sqrt{9}\ \therefore\ \boxed{y=\pm3}$