Subjecting a pronumeral

**ajay** · November 24th 2008, 02:14 AM

Hey guys, don't fully understand how to change the subject of a pro numeral in a equation so I turned for you to help me.

$V = Mv/(M-m)$

Make "m" the subject.

(Anywhere I can learn math tags?)

**earboth** · November 24th 2008, 04:50 AM

Originally Posted by ajay

Hey guys, don't fully understand how to change the subject of a pro numeral in a equation so I turned for you to help me.

$V = Mv/(M-m)$

Make "m" the subject.

(Anywhere I can learn math tags?)

To learn how to use the LaTeX code see here: http://www.mathhelpforum.com/math-he...-tutorial.html

$V = Mv/(M-m)$ multiply by (M - m) to get rid of the denominator:

$V(M-m)=Mv$ divide by V

$M - m=\dfrac{Mv}{V}$ subtract M

$-m = \dfrac{Mv}{V} - M$ multiply both sides by (-1) to change the sign of m:

$m = M-\dfrac{Mv}{V}$

$m = \dfrac{MV - Mv}{V} ~\implies~\boxed{m = \dfrac{M(V - v)}{V}}$

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