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x - wiek Ani
4x - wiek Wojtka
za 2 lata:
x + 2 - wiek Ani
4x + 2 - wiek Wojtka
3 ( x + 2 ) = 4x + 2
3x + 6 = 4x + 2
3x - 4x = 2 - 6
- x = - 4 |:(-1)
x = 4
x = 4 - wiek Ani
4x = 4 • 4 = 16 - wiek Wojtka
Odp.: Wojtek ma 16 lat, a Ania 4.
y - wiek Ani
Układ równań:
4y + 2 = 3y + 6
y = 4
x = 16