Question

Срочно плиз
2х+у=1,
5х+4у=13

Answer 1

$\displaystyle \left \{ {{2x+y=1} \atop {5x+4y=13}} \right.\\ \\\left \{ {{y=1-2x} \atop {5x+4y=13}} \right. \\\\5x+4(1-2x)=13\\x=-3\\y=1-2(-3)\\y=7\\(x,y)=(-3,7)$