Given that $M( 1, -6)$ is the midpoint of $\overline{AB}$ and $A(-2, 1)$ is one endpoint, what is the sum of the coordinates of point B?
I tried to do the latex on this one so it would be easier to read!
B = (-1/2, -5/2), so the sum of the coordinates is -3.
A(-2, 1)
M(1, -6)
B(4, -13)
4 + (-13) = -9