Question

First question. The midpoint of SR is...

Answer 1

The formula of a midpoint SR:

`M\left((x_S+x_R)/(2),\ (y_S+y_R)/(2)\right)`

We have

S(4, 1) and M(7, -5)

Substitute:

`(4+x_R)/(2)=7\qquad|\cdot2\\\\4+x_R=14\qquad|-4\\\\x_R=10\\\\(1+y_R)/(2)=-5\qquad|\cdot2\\\\1+y_R=-10\qquad|-1\\\\y_R=-11`

Answer: R(10, -11)