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

1 Answer
Johnson Z.
Dec 20, 2015

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

Explanation:

#4a+b=12#

Subtract #b# from both sides.

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

#4a=12-b#

Divide #4# from both sides.

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

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

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