Ответ:
x+3y=1
2x+5y=-21
{ x= 1-3y
{ 2x+5y=-21
2(1-3y)+5y= -21
y=23
x= 1-3×23
x= -68
(x,y)=(-68; 23)
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Ответ:
x+3y=1
2x+5y=-21
{ x= 1-3y
{ 2x+5y=-21
2(1-3y)+5y= -21
y=23
x= 1-3×23
x= -68
(x,y)=(-68; 23)