Question

points A (-1,y) and B (5,7) lie on a circle with center O (2.-3y). Find the values of your. Hence find the radius of the circle .

Answer 1

hope it will help u.
I have find the radius with the distance formula
therefore Distance b/w OB is radius.
OB=5

Answer 2

Answer:

(2-(-1))² + (y-(-3y))²= (5-2)² + (7-(-3y))²

=>9+16y² =9 +(7+3y)²

=>16y²=49+9y²+42y

=>7y²-42y-49=0

=>y²-6y-7=0

=>y²-7y+y-7=0

=>y(y-7)+1(y-7)=0

(y-7)=0 or (y+1)=0

=>y=7 or y=-1