What is the answer to:

a+4 ≥ 2a

It asks you to isolate the variable.

My answer booklet says the correct answer is

4 ≥ a.

I do not know how they reached this conclusion. My thought process told me to dividea+4byaand then divide2abya. That left me with4≥2.

What am I doing wrong? How do i get the correct answer of

4 ≥ a. My answer book does not explain it.

Please Help!

Your help is greatly appreciated!!