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)?

Answer 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.

Answer 2

so its 15?

Answer 3

NO
Try reading everything I wrote, especially

(x,y) -> (x,-y)

OK??

Or, what the heck - draw the line and its reflection.

Answer 4

What do you mean?

Answer 5

is it -1?

Answer 6

that's better.

Answer 7

is it 14?

Answer 8

Its -1

Answer 9

its -1 because you do 7-8.

Answer 10

its 69420 309