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A+B=70kg
A+4=B-3
B=A+7
A+A+7=70
2A=63
A=31,5
B=31,5+7
B=38,5
Ania wazy 31,5 kg , a Bogdan 38,5 kg
y - waga Bogdana
x+y=70
x+4=y-3
x+y=70
x-y=-7
2x=63
x=31,5
31,5+y=70
y=70-31,5
y=38,5
odp: Ania waży 31,5 kg a Bogdan 38,5 kg.
y-waga bogdana
x+y=70
x+4=y-3
x=70-y
x-y=-3-4
x=70-y
70-y-y=-7
x=70-y
-2y=-7-70
x=70-y
-2y=-77|:(-2)
x=70-y
y=38,5
x=70-38,5
y=38,5
x=31,5
y=38,5
Odp. Ania waży 31,5 kg a bogdan 38,5 :):)