Answer
$$B(10,13)$$
Work Step by Step
We have midpoint $M(6,8)$ of $AB$.
$A(2,3)$
$B(x,y)$
$\frac{2+x}{2}=6$
$2+x=12$
$x=10$
$\frac{3+y}{2}=8$
$3+y=16$
$y=13$
We have $B(10,13)$
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