Question 731725
Divide both sides by a:  b>2.  Since that is the same as the given value for b (b>2), then ab>2a.<P>
Assign a value to a.  a=3.  The equation becomes 3b>6.  Divide both sides by 3.  b>2.  It fulfills the given condition, b>2, so ab>2a is true.