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1/2x + y = 40 kg / x 2
0,1x/2 + 0,02y = 1,2 kg / x 2
x + 2y = 80 kg
0,1x + 0,004y = 2,4 kg / x (-10)
x + 2y = 80 kg
-x - 0,4y = -24 kg
( metoda przeciwnych współczynników )
1,6y = 56 kg
y = 35 kg .
1/2x + 35 = 40 / x 2
x + 70 = 80
x = 10