# How do you solve the volume formula R = 4c + a, for a?

##### 1 Answer

Jan 18, 2016

a = R - 4c

#### Explanation:

To do this 'change the subject' from R to a using similar operations used in solving equations.

4c + a = R

( subtract 4c from both sides of the equation ) to give:

4c + a - 4c =R - 4c

#rArr a = R - 4c #