1) { 10 -8 <9x -3x ; 6x -5x ≥ 6-2 .⇔{2 <6x ; x >4 .⇔{ x >1/3 ; x > 4 ⇒ x >4 .
X ∈(4 ;∞) .
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2) {(3x -5y)/3 -(x+2y) /6 =10 ; 7x -10y =62 .
{ x -5y/3 -x/6 -y/3 = 10 ; 7x-10y =62.
{ 5x/6 -2y = 10 ; 7x - 10y =62.
{ -25x/6 +10y= - 50 ; 7x -10y =62 . || + ||
7x -25x/6 =12⇒x =72/17 ;
y = (7x-62)/10 =55/17 .
ответ : x = 72/17 , y =55/17 . *** (72/17 ; 55/17 )