In doing this problem I'm coming to the issue of not knowing what the theory is in this circuit, we are given IL and RL. I am not understanding how I would get values for RCS R1 and R2 with the given...

In doing this problem I'm coming to the issue of not knowing what the theory is in this circuit, we are given I_Land R_L. I am not understanding how I would get values for R_CS
R₁
and R₂
with the given information. If other resistors are equal to each other for some reason please provide a brief explanation as to why it's that way so I can further understand these circuits.

Extracted text: Problem F3 Design a value for R,, R, and Res such that 0.5 mA can be delivered to loads up to 18k Veco Vcc oL Rcs R1 Vcco- V+ R2 Vcc / -Vcc Q1 V- 15V /-15V R2 Lo-Vcc RLoad +