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y - lata Agnieszki
x - 1 = 2y
x = y + 5
x = 2y + 1
y = x - 5
x = 2(x -5) + 1
x = 2x - 10 + 1
-x = -9
x = 9
y = x - 5
y = 4
a - wiek Agnieszki
b - 1 = 2a - 2
b = 5 + a
b - 2a = -2 + 1
b = 5 + a
5 + a - 2a = -1
b = 5 + a
-a = -1 - 5 / : (-1)
b = 5 + a
a = 6
b = 5 + 6
a = 6
b = 11
aga ma 6 lat, a basia 11 lat.