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xy = 6
y = x - 1
x(x-1) = 6
x² - x = 6
x² - x - 6 = 0
Δ = 1 + 24 = 25
√Δ = 5
x₁ = (1-5)/2 = -2
x₂ = (1+5)/2 = 3
y₁ = -2 -1 = -3
y₂ = 3 -1 = 2
{x₁ = -2
{y₁ = -3
{x₂ = 3
{y₂ = 2
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x² - 3y² = 1
x - 2y = 1
x = 1 + 2y
(1+2y)² - 3y² = 1
1 + 4y + 4y² - 3y² - 1 = 0
y² + 4y = 0
y(y + 4) = 0
y₁ = 0
y₂ = -4
x₁ = 1 + 2*0 = 1
x₂ = 1 + 2*(-4) = 1 - 8 = -7
{x₁ = 1
{y₁ = 0
{x₂ = -7
{y₂ = -4