# If #4a+b=12#, then what is #a#?

##### 1 Answer

Dec 20, 2015

#### Explanation:

Subtract

#4a+b# #color(red)(-b)=12# #color(red)(-b)#

#4a=12-b#

Divide

#4acolor(red)(-:4)=(12-b)color(red)(-:4)#

#a=(12-b)/4# or#3-b/4#