SOLUTION: M(8, 7) is the midpoint of RS. The coordinates of S are (9, 5). What are the coordinates of R?

Algebra ->  Length-and-distance -> SOLUTION: M(8, 7) is the midpoint of RS. The coordinates of S are (9, 5). What are the coordinates of R?      Log On


   

Question 859169: M(8, 7) is the midpoint of RS. The coordinates of S are (9, 5). What are the coordinates of R?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Let x and y represent the coordinates of R    

Midpoint Pt(x,y):  ( %28x%5B1%5D+%2B+x%5B2%5D%29%2F2, %28y%5B1%5D+%2B+y%5B2%5D%29%2F2++%29)

S are (9, 5).   Midpoint (8,7)

(x+9)/2 = 8

    x = 7

(y + 5)/2 = 7

     y = 9

(7, 9) coordinates of R