Answer:
1.
x1=1
x2=3
y1=5
y2=1
midpoint= (x1+x2/2, y1+y2/2)=(1+3/2,5+1/2)=(2,3)
2.
x1=2
x2=4
y1=4
y2=6
midpoint= (x1+x2/2, y1+y2/2)=(2+4/2,4+6/2)=(3,5)
3.
x1= -2
x2=4
y1=4
y2= -6
midpoint= (x1+x2/2, y1+y2/2)=(-2+4/2,4-6/2)=(1,-1)
4.
x1=0
x2=0
y1=3
y2=5
midpoint= (x1+x2/2, y1+y2/2)=(0/2,3+5/2)=(0,4)
5.
x1= -2
x2=2
y1= -6
y2=6
midpoint= (x1+x2/2, y1+y2/2)=(-2+2/2,-6+6/2)=(0,0)
6.
x1=1
x2=4
y1=4
y2=5
midpoint= (x1+x2/2, y1+y2/2)=(1+4/2,4+5/2)=(5/2,9/2)
7.
x1=-3
x2=-4
y1=5
y2=5
midpoint= (x1+x2/2, y1+y2/2)=(-3-4/2,5+5/2)=(-7/2,5)
8.
x1=5
x2= -4
y1=2
y2=6
midpoint= (x1+x2/2, y1+y2/2)=(5-4/2,2+6/2)=(1/2,4)
