Question

if r is the midpoint of line QS find the coordinates of x if QR=8x-51 and RS= 3x-6, find QS

Answer 1

hello : 
If R is the midpoint of line QS : QR=RS
8x -51 = 3x-6
8x-3x = 51-6 
5x = 45
x=45/5
x=9