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y- waga Bogdana
x+y= 70
x+ 4= y-3
x+y= 70
x-y= -7
2x = 63
y= 70 - x
x= 31,5
y= 38,5
Odp. Anita waży 31,5 kg, a Bogdan 38,5 kg.
2x=70
2x=70|:2
x=35 - tyle ważyli by oboje
34,5 - 4kg = 31,5 kg = tyle waży Anita
Bogdan waży 38,5 kg.