Question

x+y=22

y-x=8    Система 2 уравнений

Answer 1

x+y=22
y-x=8

x=22-y
y-x=8

x=22-y
y-(22-y)=8

x=22-y
y-22+y=8

x=22-y
2y=30

x=22-y
y=15

x=22-15
y=15

x=7
y=15