geometry
posted by rose .
the coordinates of point S are given. the midpoing of RS is (6,10). find the coordinates of point r. s(0,8)

If we let M be the midpoint,
SM = (0,8)  (6,10) = (6,18)
that means that MR must also be (6,18), or R = M(6,18)
R = (6,10)  (6,18) = (12,28)