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September 10th, 2011, 12:19 PM   #1
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Changing the subject of a formula

Hi,
I know how to change the subject of a formula like u=v+2t making t the subject. However, I am finding it difficult to change the subject of a formula when there is 2 of the subject in the equation. For example,
s= pqx+ 5xy and making x the formula.
I have just started on improving my maths skills after 4 years not doing any! Any help would be appreciated.
Thank you
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September 10th, 2011, 01:10 PM   #2
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Re: Changing the subject of a formula

In the example you gave:



To solve for x, first factor out the x that is common to both terms on the right:



Now, divide both sides by pq + 5y:

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