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Since both points lie on the circle, so, length AO is equal to length BO. since both are the radius of given circle.
By applying distance formula,
(2-(-1))² + (y-(-3y))²= (5-2)² + (7-(-3y))²
⇒9+16y² =9 +(7+3y)²
(y-7)=0 or (y+1)=0
y=7 or -1

let me know, if there is any doubt regarding this explaination :)
2 4 2
Qais plz. Answer my question
One bad apple is accidentally mixed with some good apples in a basket. As a result of which 25% of the total apples go bad. Now the number of good apples
in the basket is 30. Find the number of good apples kept in the basket previously. What will happen if one bad person is mixed with some good ones?
see...25% apple is bad..means 75% is good and is equals to 30..so 100% will be 40, And removing the bad one it will be 39 
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