Question

ajudem por favor rapido​

Answer 1

Resposta:

Explicação passo a passo:

LETRA A

$\left(\begin{array}{ccc}4&20&-4\\0&8&3\end{array}\right)$

a multiplicação por um escalar resulta cada elemento da matriz aij seja multiplicado... então peguei todos os elementos e multipliquei por 4

$A + \left(\begin{array}{ccc}4&20&-4\\0&8&3\end{array}\right) = \left(\begin{array}{ccc}8&12&6\\7&-2&12\end{array}\right) \\\\A = \left(\begin{array}{ccc}4&-8&10\\7&-10&9\end{array}\right)$

LETRA B

$x + y = \left[\begin{array}{ccc}4&3\\-1&6\end{array}\right] \\ x - y = \left[\begin{array}{ccc}2&5\\3&4\end{array}\right] \\2x = \left[\begin{array}{ccc}6&4\\2&10\end{array}\right] \\\\x = \left[\begin{array}{ccc}3&2\\1&5\end{array}\right] \\\\\\\left[\begin{array}{ccc}3&2\\1&5\end{array}\right] + y = \left[\begin{array}{ccc}4&3\\-1&6\end{array}\right] \\\\\\\therefore\\y = \left[\begin{array}{ccc}1&-1\\-2&1\end{array}\right]$