Answer:
TU = 12
Explanation:
Since T is on the line segment of SU
SU = ST + TU..........(1)
SU = 3x -7
TU = x -1
ST = x + 7
Substituting these values into equation (1)
3x-7 = x +7 + x -1
3x -7 = 2x + 6
x = 13
For the numerical length of TU
TU = x - 1
TU = 13 - 1
TU = 12