№22 15х+10=7+12у 15х+3=12у 5х+1=4у у=(5х+1)/4 х= (4у-1)/5 4х+4у+х=31 5х+4у=31 у=(31-5х)/4 х=(31-4у)/5 №24 2х+4у-7у=6 2х-3у=6 х=(6+3у)/2 у= - (6-2х)/3 10х+5у-х=2х+60 7х+5у=60 х= (60-5у)/7 у=(60-7х)/5