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y=waga bogdana
x+y=70kg
x+4=y-3kg
x=70-y
70-y+4=y-3
-y-y=-3-70-4
-2y=-77
y=77:2
y=38,5kg
x=70-38,5=31,5
odp ania waży 31,5, a bogdan 38,5kg
y-waga Bogdana
x+y=70
x+4=y-3
x+y=70
x-y=-7
2x=63/:2
x=31,5
31,5+y=70
y=38,5
odp:Ania waży 31,5 kg , a Bogdan 38,5 kg.