30
Пошаговое объяснение:
x=0.25y
(y+3)/(x-3)=9
(y+3)/(0.25y-3)=9
y+3=9*(0.25y-3)
y+3=2.25y-27
y-2.25y=-27-3
-1.25y=-30
y=-30/(-1.25)
y=24
x=0.25*24=6
x+y=6+24=30
проверка
30
Пошаговое объяснение:
x=0.25y
(y+3)/(x-3)=9
(y+3)/(0.25y-3)=9
y+3=9*(0.25y-3)
y+3=2.25y-27
y-2.25y=-27-3
-1.25y=-30
y=-30/(-1.25)
y=24
x=0.25*24=6
x+y=6+24=30
проверка