What is the equation of a circle with a center at (1,1) and a radius of 5 ?

The equation of a circle:

where

(h, k) - the coordinates of a center

r - the radius

We have

(1, 1) → h = 1 and k = 1

r = 5

Substitute:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

a

step-by-step explanation: