To find the middle point we have to add each coordinate and divide by 2:
x1=3
y1=-1
x2=-9
y2=8
(x1+x2)/2= (3+(-9))/2=(-6/2)=-3
(y1+y2)/2= ((-1)+8)/2)=(7/2)=3.5
1.6m questions
2.0m answers