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Rozwiązujemy układ równań:
y = x - 3
xy = 4
x(x-3) = 4
x² - 3x - 4 = 0
Δ = 9 + 16 = 25
√Δ = 5
x₁ = (3-5)/2 = -1 ∉ D
x₂ = (3+5)/2 = 4
x = 4
y = 4 - 3 = 1
{x = 4
{y = 1