Question

Найдите сумму решений системы уравнений 5х-3у=4 х+3у=8

Answer 1

$\left \{ {{5x-3y=4} \atop {x+3y=8}} \right. \left \{ {{x=8-3y} \atop {5*(8-3y)-3y=4}} \right. 40-15y-3y-4=0 36-18y=0 -18y=-36 y=2 x=8-3*2=2$