Is this solution of linear circuit correct?
Since there's  1.5mA through R1, there also has to be 1.5mA through the device in series with it

Since there's 2 volts aceoss R2, there also has to be 2v across the device in parallel with it.

Since there's 2 volts across R2, 4 volts across the device in series with R1 and Vs is 8 volts, then there has to be 2 volts across R1.

With all that in mind, we can say:



and the proof is in the voltage divider.