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y-wiek marka 10
2x-wiek marka 10
x+5=y 5+5=10
2x=y
2x=y
x+5=Y
x+5=2x
x=5
odp. jacek ma 5 lat a marek ma 10 lat
y- Marek
x+5 - wiek Jacka za 5 lat
y = 2x
x + 5 = 2x
y = 2x
x - 2x = -5
y = 2x
-x = -5
y = 2x
x = 5
y = 2 × 5
x = 5
x = 5
y = 10
Odp: Jacek ma 5 lat, a Marek ma 10 lat