Question

хелп....................

Answer 1

$\displaystyle \left \{ {{2y+10x=8} \atop {10x-2y=0}} \right.\\\\ \left \{ {{2y+10x=8} \atop {10x=2y}} \right. \\\\ 2y+2y=8\\y=2\\10x=2*2\\\\ x=\frac{2}{5}=0,4\\ \\ (x,y)=(0,4;2)$