Algebraic Manipulation: Solving Complex Equations

[Schniz2]

Homework Statement

Somehow the upper two statements are manipulated to get the lower one but i can't work out how... (see attatched image)

Homework Equations

N/A

The Attempt at a Solution

Oh you don't want to see mypages of scribble. I can't get close to that expression!

 

[Mark44]

In the first two equations you have expressions that are both equal to V_CC/3, so you can equate the two expressions on the left sides.

Doing that, you can solve for R_BB as a constant multiple of R_E.

Then, substitute in either of your first two equations to get the desired equation in V_BB, V_f, and V_CC.

 

[Schniz2]

ahh, finally got it... the last time i tried to do it that way i got and extra factor somehow and that's what was messing me up.

thanks!