Question

M(5, 7) is the midpoint of rs The coordinates of S are (6, 9). What are the coordinates of R?

(5.5, 8)


(7, 11)


(10, 14)


(4, 5)

Answer 1

`\text{Let the coordinates of R be (x, y)}`


`x_M = (x_R + x_S)/(2)`

`5 = (x + 6)/(2)`

`10 = x + 6`

`x = 4`


`y_M = (y_R + y_S)/(2)`

`7 = (y + 9)/(2)`

`14 = y + 9`

`y = 5`


`\therefore R(4, 5)`

Answer 2

the correct answer is D (4,5)