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y - wiek drugiego chłopca
x + y = 22
x + 1 = 2(y +1)
x = 22 - y
22 - y +1 = 2y +2
-3y = -21 /:
y = 7
x = 22 - 7
x = 15
Odp: Chłopcy mają 7 i 15 lat.
y - wiek drugiego chłopca
x+y = 22
x+1=2y+2
x+y=22
x=2y+1
2y+1+y=22
x=2y+1
3y=21 / :3
x=2y+1
y=7 lat
x=15 lat