Find the coordinates of the other endpoint of a segment with the given endpoint and mid point

28) Q(-5, 9)
M(-8, -2)

29) A(6,7)
M(10, -7)

30) D(-3.5, -6)
M(1.5, 4.5)

Question

Find the coordinates of the other endpoint of a segment with the given endpoint and mid point

28) Q(-5, 9)
       M(-8, -2)

29) A(6,7)
      M(10, -7)

30) D(-3.5, -6)
       M(1.5, 4.5)

anonymous · Answer

I'd just extrapolate it out. Or did they give you formulas they wanted you to use?

28) Change from start to midpoint:
-8-(-5) = -3
-2-9 = -11

28) End point
-8-3 = -11
-2-11 = -13

Therefore, the unknown endpoint is (-11,-13) for Q28

anonymous · Answer

29) (14,-21)
30) (6.5,15)