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x + 13 wiek agnieszki
x + x+ 13 = 23
2x = 23-13
2x=10 /:2
x=5
x + 13 = 18
julka ma 5 lat, a agnieszka 18
Agnieszka ma 5 lat
Julia ma 18 lat
x - wiek Agnieszki
y - wiek Julii
x + y = 23
y = x-13
y + x = 23
y - x = -13
2y = 10 |:2
y = 5 lat ma Julia
x + y = 23
x = 23 - 5
x = 18 lat ma Agnieszka