Question

qual os valores de x e y para que se tenha a=b

Answer 1

$1) \left[\begin{array}{ccc}x+3&11\\9&2y-7\\\end{array}\right] = \left[\begin{array}{ccc}-5&11\\9&13\\\end{array}\right] \\ \\ x+3 = -5 =\ \textgreater \ x = -5 - 3 =\ \textgreater \ x = -8 \\ \\ 2y - 7 = 13 =\ \textgreater \ 2y = 13 + 7 =\ \textgreater \ y = \frac{20}{2} =\ \textgreater \ y=10 \\ \\ ----------------- \\ \\ 2) \left[\begin{array}{ccc}x+3&3\\1&x-y\\\end{array}\right] = \left[\begin{array}{ccc}10&3\\1&2\\\end{array}\right] \\ \\ x + 3 = 10 =\ \textgreater \ x = 10 - 3 =\ \textgreater \ x = 7 \\ \\ x - y = 2 =\ \textgreater \ (7) - y = 2 =\ \textgreater \ y = 7 - 2 =\ \textgreater \ y = 5$