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4x -wiek Doroty
4x+2 = 3(x+2)
4x+2 = 3x+6
x= 4
4x=4*4 =16
Wiek Doroty to 16 lat, wiek Maćka to 4 lata.
b)
4 - wiek Maćka
16 -wiek Doroty
x - za tyle lat Dorota będzie 2 razy starsza od Maćka
16+x = 2(4+x)
16+x = 8+2x
8 = x
Odp. Za osiem lat Dorota będzie 2 razy starsza od Maćka.