This is a sedra-smith microelectronics excercise question for which I can not find the answer and I hoped for perhaps a solution here?
(not a direct answer)
I don't use the equations.
I figure it out from datasheet plots and excel as I did for the diode.
Then I verified on Falstad Simulator with my parameters
Since Ri load line at BJT saturation or FET conduction has 50% factory tolerance , your choice of datasheets matters with overdrive levels.