Question

Ma poate ajuta cineva la punctul c)? Dau coronita

Answer 1

$\displaystyle \begin{pmatrix}3&1\\2&1\end{pmatrix} \begin{pmatrix}x\\y\end{pmatrix}=\begin{pmatrix}2\\2\end{pmatrix} \\ \\ \begin{pmatrix}3x+y\\2x+y\end{pmatrix}=\begin{pmatrix}2\\2\end{pmatrix} \\ \\ \left \{ {{3x+y=2} \atop {2x+y=2}} \right. \\ \\ 3x+y=2 \Leftrightarrow x+(2x+y)=2 \Leftrightarrow x+2=2 \Leftrightarrow x=0. \\ \\ Rezulta~y=2. \\ \\ Solutie:~x=0~si~y=2.$