Question Number 171356 by LEKOUMA last updated on 13/Jun/22
$${Solve} \\ $$$$\left.\mathrm{1}\right)\:\left(\mathrm{2}{x}−{y}\right){dx}+\left(\mathrm{4}{x}−\mathrm{2}{y}+\mathrm{4}\right){dy}=\mathrm{0} \\ $$$$\left.\mathrm{2}\right)\:\left(\mathrm{2}{x}−{y}+\mathrm{4}\right){dy}+\left({x}−\mathrm{2}{y}+\mathrm{5}\right){dx}=\mathrm{0} \\ $$