HOTS... Just solve this questions

Step-by-step explanation:

8.  B is the midpoint of AD

A (x,y)

D( -1,3)      B (  (x-1)/2, (y+3)/2)  and B ( 1,1)

then (x-1)/2=1, x-1=2   ( +1)  ,  x= 2+1,  x=3

        (y+3)/2=1, y+3=2 ( -3)     y=2-3,  y= -1

then A (3, -1)

9. (-8,3)

    (s,3)      the midpoint  (0,u)

then    (s-8)/2=0,   s=8

           (3+3)/2=u,   u=6/2,   u= 3

10.  a=1   ( the y coordinate is  the same as the midpoint

  A(3,1)

   B(x,y)    the midpoint (5,1)

   (3+x)/2=5,   3+x=10 ,   x=10-3,  x=7

    (y+1)/2=1,  y+1=2,y=2-1,     y=1

B(7,1)

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation: