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Rearranging Formulas

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Several formulas need to be rearranged so that a given variable ends up being the subject.

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It shows how to rearrange formulas and equations so that a given variable ends up being the subject. The solution is detailed and was rated '5/5' by the student who posted the question originally.

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Make x the subject:
(a)
The goal is to have one side of equation only has x terms
So add 18 to both sides:

Divide 13 from both sides:

(b)
To solve for x, we need to first move x out from the denominator, so multiply (x + 18) to both sides:

The answer in your scan is not correct.

(c)

Multiply x to both sides:

Transpose the following ...

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