Answer
$$B(10, 13)$$
Work Step by Step
We have:
$M(6, 8)$
$A(2, 3)$
$B(x_2, y_2)$
In general, we know a midpoint formula for point $M$ coordinates of $x$ and $y$, that is between points $A(x_1, y_1)$ and $B(x_2, y_2)$:
$$x=\frac{x_1+x_2}{2}$$ $$y=\frac{y_1+y_2}{2}$$
Our only unknown variables are $x_2$ and $y_2$. So we simply input what we know and find the unknown variables.
$6=\frac{2+x_2}{2}$
$2+x_2=12$
$x_2=10$
$8=\frac{3+y_2}{2}$
$3+y_2=16$
$y_2=13$
We found the point $B(10, 13)$
