Question

If S is the midpoint of RT, RS=5x+17, and ST=8x-31, find RS.

Answer 1

I think you are asking for RT.

5x+17+8x-31

13x-14

Answer 2

5x+17=8x-31

+5x   =+5x

   17=12x-31

 +31=   +31

   48=12x

     4=x

RS=5(4)+17=37