Ania i Bogdan ważą razem 70kg. Gdyby Ania przytyła 4 kg , a Bogdan 3 kg schudł, to oboje ważyli by tyle samo . Ile waży Ania a, a ile Bogdan
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x+y= 70
x+4 = y-3
x=70-y
70-y+4 = y-3
-2y=-77
y= 38,5 kg - waga Bogdana
y=70-38,5 =31,5 kg waga Ani
x - Ania
y - Bogdan
x+y = 70
x+4 = y-3
x = 70-y
70-y+4 = y-3
x = 70-y
-2y = -77 / /: -2
x = 70-y
y = 38,5
x = 70-38,5 = 31,5
y = 38,5
Odp. Ania waży 31,5 kg, a Bogdan 38,5 kg.