6y-5x=1
2*(x-1)+3y-x=-19 2x-2+3y-x=-19 x+3y-2=-19 x=-17-3y=-(17+3y)
6y-5*(-(17+3y))=-1
6y+85+15y=1
21y=-84 |÷21
y=-4 ⇒
6*(-4)-5x=1
-24-5x=1
-5x=25 |÷(-5)
x=-5
ответ: х=-5 у=-4.
6у-5х=1
2(х-1)+3у-х=-19
6у-5х=1
2х-2+3у-х=-19
6у-5х=1
х+3у=-17
6у-5х=1
х=-17-3у
6у-5(-17-3у)=1
х=-17-3у
6у+85+15у=1
х=-17-3у
21у=-84
х=-17-3у
у=-4
х=-17-3*(-4)
у=-4
х=-5
ответ: (-5; - 4)
