SOLUTION: I am having trouble with two equations - solving for variables... A = P+PRT --------- solve for P ..this one I am not sure where to begin, since there are two P's in t

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Question 240059: I am having trouble with two equations - solving for variables...

A = P+PRT --------- solve for P
..this one I am not sure where to begin, since there are two P's in the equation. The only thing I can think of is to subtract the RT from both sides (but am not sure if this is correct).
A = 1/2 h (B+b) ------------- solve for b
(having problems trying to type it- but the first part is 1/2 h - 'h' is next to the 1/2)
..do I multiply everything by 1/2?- not sure how to begin/complete the problem.
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
A = P+PRT --------- solve for P
Factor the right side:
A = P(1 + RT)
Solve for "P":
P = A/(1 + RT)
--------------------------
A = (1/2) h (B+b) ------------- solve for b
---
Multiply both sides by 2 to get:
2A = h(B + b)
Divide both sides by "h":
B + b = (2A)/h
Subtract "b" from both sides.
b = [(2A)/h] - B
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Cheers,
Stan H.