0,5(x+y)=60
3(y-x)=60
x+y=120
y-x=20
x=120-y
x+y+y-x=120+20
2y=140
y=70
x=50
х = 50, у = 70
Объяснение:
х = -у+120
3у - 3(120-у)=60
3у - 360 - 3у = 60
6у = 420
у = 70
х = 120 - 70 = 50
0,5(x+y)=60
3(y-x)=60
x+y=120
y-x=20
x=120-y
x+y+y-x=120+20
x=120-y
2y=140
x=120-y
y=70
x=50
y=70
х = 50, у = 70
Объяснение:
х = -у+120
3у - 3(120-у)=60
3у - 360 - 3у = 60
6у = 420
у = 70
х = 120 - 70 = 50