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a+4=b-3
a=70-b
70-b+4=b-3
a=70-b
2b=77
b=38,5
a=31,5
Ania waży 31,5 kg , a Bogdan38,5 kg.
y-waga Bogdana
x+y=70
x+4=y-3
x=70-y
70-y+4=y-3
x=70-y
-2y=-77
x=70-y
y=38.5
x=70-38.5
y=38.5
x=31.5
y=38.5