[tex]\displaystyle\\
Notatii:~~x=bluze~~si~~y=rochii\\\\
\left \{ {{4x+3y=17~~~|\times 3}\atop{3x+2y=12~~|\times(-4)}}\right.\\\\\\
\left\{{{12x+9y=51}\atop {-12x-8y=-48}}\right.\\\
\text{- - - - - - - - - - - - - Adunam ecuatiile.}\\
~~~~~~/~~~+\boxed{\bf y=3~\text{\bf metri de material pentru o rochie.}}\\
3x+2y=12~~unde: ~y=3~m\\
3x+2\cdot3=12\\
3x+6=12\\
3x=12-6\\
3x=6\\\\
x=\frac{6}{3}\\\\
\boxed{\bf x = 2~\text{\bf metri de material pentru o bluza.}}[/tex]