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x-8 - wiek brata Marka
x+x - 8 = 24
2x = 24+8
2x = 32 /2
x = 16
x-8 = 16 -8 = 8
Marek ma 16 lat, a jego brat 8
y - wiek brata Marka
x + y = 24
x = y + 8
y + 8 + y = 24
2y = 24 - 8
2y = 16
y = 8
Brat Marka ma 8 lat.
x = y + 8 = 8 + 8 = 16
Marek ma 16 lat.