Question

Me ajudem por favor e pra amanhã!

Answer 1

$\left(\begin{array}{ccc}2&5\\10&1\\\end{array}\right) = \left(\begin{array}{ccc}x+y&5\\3x-y&1\\\end{array}\right)\\\\\\ \Rightarrow\begin{cases}x+y=2\\ 3x-y=10\end{cases}\\ ~~~~~~~-----\\ ~~~~~~~4x~~~=~~12\\ ~~~~~~~~~~~x=12/4\\ ~~~~~~~~~~~~x=3\\\\\\ x+y=2\\ 3+y=2\\ y=2-3\\ y=-1\\\\\\ x=3~~e~~y=-1$