Question

M (7,3) is the midpoint of segment RS. The coordinates of point S are (8,4). What are the coordinates of R?

Answer 1

Given two pairs of coordinates, (x1, y1) and (x2, y2), the midpoint of a line joining them is found at ([x1+x2]/2, [y1+y2]/2).

To find the x coordinate of point R:
7 = (x - 8)/2 --> x = 6

To find the y coordinate of point R:
3 = (y + 4)/2 --> y = 2

Therefore R is found at (6,2).