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simultaneous equations for voltage divider- how about the other one?

W

wanna-know12345

Given beta = 100, Vce= 4V, Ic=1.25mA, Vbe =0.7V

IbRth = Vth - Vbe - Ve

Rth= R1R2/(R1+R2)
Vth = R2*Vcc/(R1+R2)

In order to find the two unknown (R1 and R2) using simultaneous equations, I need another equation right? But I have no idea how to get another one, hope you guys can let me know, thank you so much.
 

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