Question

please answer this question ​

Answer 1

Answer:

y=-9,3

Step-by-step explanation:

AB=√(2-10)²+(-3-y)²= 10

64+(9+y²+6y) =10²

64+9+y²+6y=100

73-100+y²+6y=0

-27+y²+6y=0

y²+6y-27=0

y²+(9-3)y-27=0

y²+9y-3y-27=0

(y²+9y) -(3y-27)=0

y(y+9)-3(y+9)=0

(y-3)(y+9)=0

y-3=0=y=3

y+9=0=-9

therefore y=-9,3