[tex]\displaystyle\bf\\\begin{cases}\bf5d+9t=161\\\bf8d+10t=218~\Big|:2\end{cases}\\\\\begin{cases}\bf5d+9t=161~\Big|\times(-4)\\\bf4d+5t=109~\Big|\times5\end{cases}\\\\\begin{cases}\bf-20d-36t=-644\\\bf~~~20d+25t=545\end{cases}\\\\------------~~(Adunam ecuatiile)\\\\~~~~~~~~/~~~-11t=-99\\\\t=\frac{-99}{-11}\\\\\boxed{\bf t=9~betisoare~pentru~triunghi}\\\\4d+5t=109\\4d+5\times9=109\\4d+45=109\\4d=109-45\\4d=64\\\\d=\frac{64}{4}\\\\\boxed{\bf d=16~betisoare~pentru~dreptunghi}[/tex]
