1.x=8+3y
2x-y=6
2(8+3y)-y=6
y=-2
x=8+3•(-2)
x=2
(x,y)=(2,-2)
2-3•(-2)=8
2•2-(-2)=6
8=8
6=6
Ответ: (x,y)=(2,-2)
2.4x-5y=-83
5y=29-2x
4x-(29-2x)=-83
x=-9
5y=29-2•(-9)
y=47/5
(x,y)=(-9,47/5)
4x(-9)-5•47/5=-83
2•(-9)+5•47/5=29
-83=-83
29=29
Ответ: (x,y)=(-9,47/5).