Hello. I need conceptual help. I need to determine R, nR and mR in this circuit. 
I am using the following formulas to determine the values of the resistances:

I have:
Vsat =±13 V
RL=10kΩ
VLT = 2V
VUT = 4V
I am following the next procedure:

I am having a real hard time determining which resistances to use in the procedure. I could really use some help, as I'm also struggling a lot with circuit analysis. (Does RL = R1?)
[Note: The problem suggest using a Potentiometer to adjust the resistance values, but I really don't have the knowledge, nor the resources. We are using LTSPICE XVII for these excercises]
I would really appreciate some help.
This is what I've got, changing the resistance values manually:



I am using the following formulas to determine the values of the resistances:

I have:
Vsat =±13 V
RL=10kΩ
VLT = 2V
VUT = 4V
I am following the next procedure:

I am having a real hard time determining which resistances to use in the procedure. I could really use some help, as I'm also struggling a lot with circuit analysis. (Does RL = R1?)
[Note: The problem suggest using a Potentiometer to adjust the resistance values, but I really don't have the knowledge, nor the resources. We are using LTSPICE XVII for these excercises]
I would really appreciate some help.
This is what I've got, changing the resistance values manually:

