Points $P$ and $R$ are located at (2, 1) and (12, 15) respectively. Point $M$ is the midpoint of segment $\overline{PR}$. Segment $\overline{PR}$ is reflected over the $x$-axis. What is the sum of the coordinates of the image of point $M$ (the midpoint of the reflected segment)?
its -1 because you do 7-8.
is it -1?
just use what you know. This is not hard.
M = ((2+12)/2 , (1+15)/2) = (7,8)
When PR is reflected, so is M.
(x,y) -> (x,-y)
So now you can easily find the image M', and thus the answer.
What do you mean?
Its -1
so its 15?
its 69420 309
NO
Try reading everything I wrote, especially
(x,y) -> (x,-y)
OK??
Or, what the heck - draw the line and its reflection.