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Skrzynia x+3kg
x+x+3kg=36kg
2x+3kg=36 kg / -3
2x = 33 /2
x=16,5
Odp. Worek waży 16,5kg a Skrzynia 19,5 kg
y-waga worka
x=2y-3
x+y=36
x-2y=-3
x+y=36 /*2
x-2y=-3
2x+2y=72
3x=69 /:3
x=23kg
36-x=y
36kg-23kg=13kg
Odp.: Skrzynia waży 23 kg,a worek 13 kg.
y - worek
x = 2y + 3
y + x = 36
2y + 3 = 36 - y
3y = 33 /:3
y = 11
x = 36 - y
x = 25