Question

решит систему уравнения x+y=6, 3x-5y=2

Answer 1

$\left \{ {{x+y=6} \atop {3x-5y=2}} \right. \left \{ {{x=6-y} \atop {3x-5y=2}} \right.\\ \\3(6-y)-5y=2 \\18-3y-5y=2 \\18-8y=2 \\-8y=2-18 \\-8y=-16 \\y=2 \\x=6-2 \\x=4 \\(x,y)=(4,2)$

Answer 2

Х+У=6
3х-5у=2

У=6-х
3х-5*(6-х)=2

У=6-х
3х-30+5х=2
8х=32
Х=4

У=6-4=2

Х=4
У=2