x: Produktionsfaktor B
y: Produktionsfaktor A
F(x, y) = e^{0.3·y + 0.05·x + 0.5·y·x}
Fx(x, y) = e^{0.3·y + 0.05·x + 0.5·y·x}·(y/2 + 1/20)
Fy(x, y) = e^{0.3·y + 0.05·x + 0.5·y·x}·(x/2 + 3/10)
y' = - Fx(x, y) / Fy(x, y) = - (y/2 + 1/20) / (x/2 + 3/10)
y' = - (1.8/2 + 1/20) / (2.1/2 + 3/10) = - 19/27 = - 0.7037