My Math Forum Changing the subject of a formula

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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: 461 Math Focus: Calculus/ODEs Re: Changing the subject of a formula In the example you gave: $+5xy$ To solve for x, first factor out the x that is common to both terms on the right: $(pq+5y)$ Now, divide both sides by pq + 5y: $x=\frac{s}{pq+5y}$

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