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b=a+5
b-1=2(a-1)
b-1=2a-2
b=2a-2+1=2a-1
2a-1=a+5
2a-a=5+1
a=6
b=a+5=6+5=11
Basia ma 11 lat, a Agnieszka 6
x - teraz
x - 1 - rok temu
wiek Agnieszki :
y - teraz
y - 1 - rok temu
x - 5 = y
x - 1 = 2 ( y - 1 )
x - 5 = y
x - 1 = 2y - 2
x - y = 5 | * ( - 2 )
x - 2 y = - 2 + 1
- 2x + 2y = - 10
x - 2y = -1
-x = - 11 | : ( -1 )
x = 11
x - 5 = y
11 - 5 = y
y = 6
x = 11
y = 6
Odp. : Basia ma 11 lat, a Agnieszka 6 lat.
Pozdrawiam! :)