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September 10th, 2011, 12:19 PM  #1 
Newbie Joined: Sep 2011 Posts: 16 Thanks: 0  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 
September 10th, 2011, 01:10 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,155 Thanks: 462 Math Focus: Calculus/ODEs  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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