Achar, se possível, os valores de x e y, tais que:

 \left[\begin{array}{ccc}-1&4\\0&x -2\end{array}\right] = \left[\begin{array}{ccc}y&4\\0&7\end{array}\right]

e

 \left[\begin{array}{ccc}x&0\\-1&y\end{array}\right] = \left[\begin{array}{ccc}2&0\\y&x\end{array}\right]

Gostaria do passo a passo de como chegar a solução!
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