Fine the other endpoint of line segment with given endpoint and midpoint

Question

endpoint (-5,-5) and midpoint (1,4)

Answer 1

-5 to 1 is a distance of 6

-5 to 4 is a distance of 9

add another 6 to 1 to get 7 for the difference in x coordinates

add another 9 to 4 to get 13 for the difference in y coordinates

(7,13) is the other end point

just extend the line up by the same distance as the other end point is down

you don't need to calculate the actual distance between points, just the difference in x coordinates and the difference in y coordinates.