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y - waga piłeczki
x + 0.9 = y
2x = y + 0.7
x - y = -0.9 / * (-2)
2x - y = 0.7
-2x + 2y = 1.8 równania dodajemy stronami
2x- y = 0.7
y = 2.5
x - 2.5 = - 0.9
x = 2.5 - 0.9
x = 1.6
Ptak waży 1.6g.