70kg/2=35
Ania 35kg-4kg=31,5kg
Bogdan 35kg+3kg=38,5kg
Odp. ania wazy 31,5kg a bogdan waży 38,5 kg
x- masa Ani
y- masa Bogdana
x+y=70
x+4=y-3
x-y=-3-4
dodajemy stronami
2x=63 /:2
x=31.5 tyle wazy Ania
31.5+y=70
y=70-31.5
y=38.5 tyle wazy Bogdan
Odp. Ania waży 31.5kg , a Bogdan 38.5kg.
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70kg/2=35
Ania 35kg-4kg=31,5kg
Bogdan 35kg+3kg=38,5kg
Odp. ania wazy 31,5kg a bogdan waży 38,5 kg
x- masa Ani
y- masa Bogdana
x+y=70
x+4=y-3
x+y=70
x-y=-3-4
dodajemy stronami
2x=63 /:2
x=31.5 tyle wazy Ania
x+y=70
31.5+y=70
y=70-31.5
y=38.5 tyle wazy Bogdan
Odp. Ania waży 31.5kg , a Bogdan 38.5kg.