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x - y + 4 = 0 ==> x = y - 4
(y - 4)² + y² + 2(y - 4) - 5y - 21 = 0
y² - 8y + 16 + y² + 2y - 8 - 5y - 21 = 0
2y² - 11y - 13 = 0
(2y - 13)(y + 1) = 0
2y - 13 = 0 atau y + 1 = 0
y = 13/2 atau y = -1
untuk y = -1 didapat
x = -1 - 4 = -5
untuk y = 13/2
x = 13/2 - 4 = 5/2
x₁.x₂ + y₁.y₂ =
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