Question

СРОЧНО!решите систему уравнений

Answer 1

$\displaystyle \left \{ {{2u+5y=6} \atop {3u+7y=5}} \right.\\ \\7(2u+5y)-5(3u+7y)=7*6-5*5\\-u=17\\u=-17\\2u+5y=6\\y=8\\(u,y)=(-17,8)$