Pusat (1,-5). Carilah koordinat Y pada X = -2

(x-1)²+(y+5)² = r²

misal r = 1

x² + y² - 2x + 10y + 25 = 0
(-2)² + y² -2(-2) + 10 y + 25 = 0
y² + 10y + 25 = 0
(y + 5)(y + 5) = 0
y = -5