I'm trying to find out what process you need to do to complete equations like this. Example: T is the midpoint of SU. If ST = x + 13 and SU = 9x - 2, what is ST? I want to know what this type of thing is completed, what it's called, even Khan academy links. Having a lot of trouble here

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have

8/k

step-by-step explanation: