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x² - 4x - [(y -2) (y + 2)] = (x - 3)² - (y - 1)²
x + 2y = 5
x² - 4x - y² + 4 = x² - 6x + 9 -y² + 2y - 1
x = 5 - 2y
-4x + 4 = -6x + 9 + 2y - 1
x = 5 - 2y
2x -2y - 4 = 0
x = 5 - 2y
2(5 - 2y) - 2y - 4 = 0
x = 5 - 2y
10 - 4y - 2y - 4 = 0
x = = 5 - 2y
-6y = -6/: (-6)
x = 5 - 2y
y = 1
x = 3