Question

3х+5у=20
6х+10у=7
Решите систему

Answer 1

$left { {{3x+5y=20, |cdot (-2)} atop {6x+10y=7}} right. ; left { {{-6x-10y=-40} atop {6x+10y=7}} right. ; oplus ; left { {{0=-33} atop {6x+10y=7}} right. ; ; Rightarrow \\net; ; reshenij$