Answer with Step-by-step explanation:
If the mid point of (x1,y1) and (x2,y2) is (a,b) then,
\(a=\dfrac{x1+x2}{2}\ and\ b=\dfrac{y1+y2}{2}\)
Here, (x1,y1)=(9,5) and (a,b)=(8,7) we have to find (x2,y2)
\(8=\dfrac{9+x2}{2}\ and\ 7=\dfrac{5+y2}{2}\)
⇒16=9+x2 and 14=5+y2
⇒x2=16-9 and y2=14-5
⇒ x2=7 and y2=9
Hence, The coordinate of R is:
D) (7, 9)
