Homework Help: Arranging & Combining Equations (problem!)

drsponge · Apr 7, 2012

Figured it out!

Mark44 · Apr 7, 2012

drsponge said: ↑

1. The problem statement, all variables and given/known data

P = aR²T⁴
and
E = p / bd²

(a and b are constants.)

2. Relevant equations

If these two equations are combined and rearranged an expression can be derived for a/b:
a / b = Ed² / R²T⁴

Show how this has been done, step by step.

3. The attempt at a solution

I have no idea where to begin & I can't find good instruction anywhere on how to handle this.

An obvious first step would be to divide each side of the first equation by the corresponding side of the second equation.

scurty · Apr 7, 2012

drsponge said: ↑

1. The problem statement, all variables and given/known data

P = aR²T⁴
and
E = p / bd²

(a and b are constants.)

2. Relevant equations

If these two equations are combined and rearranged an expression can be derived for a/b:
a / b = Ed² / R²T⁴

Show how this has been done, step by step.

3. The attempt at a solution

I have no idea where to begin & I can't find good instruction anywhere on how to handle this.

Are little p and big P the same variable? In the final equation they don't appear so I would assume you solve for P in one equation and plug it into the other equation for P.

drsponge · Apr 7, 2012

scurty said: ↑

Are little p and big P the same variable? In the final equation they don't appear so I would assume you solve for P in one equation and plug it into the other equation for P.

Sorry they're the same variable.

drsponge · Apr 7, 2012

Mark44 said: ↑

An obvious first step would be to divide each side of the first equation by the corresponding side of the second equation.

I don't know how this would go though? Divide both sides by P / bd² to give bd² = aR2T4 / p / bd²?

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Homework Help: Arranging & Combining Equations (problem!)

drsponge

Mark44

Staff: Mentor

scurty

drsponge

drsponge