Respuesta :

Answer:

25y-4x

Step-by-step explanation:

Nevens

[tex]{x}^{2} + {y}^{2} - 4x + 2y - 31 = 0 \\ {x}^{2} + {y}^{2} - 4x + 2y = 31 \\ ({x}^{2} - 4x + 4) +( {y}^{2} +2y + 1) = 31 + 4 + 1 \\ {(x - 2)}^{2} + {(y + 1)}^{2} = 36 = {6}^{2} [/tex]

so from the equation

center ( 2 , -1 )

radius 6