I think so that graph will help you...................................
 
        
        
        
Not sure how to do it in this form but in slope intercept form for example if the slope was -4/3 the perpendicular would be 3/4 it’s the negative reciprocal of the answer
        
             
        
        
        
Answer:
See below
Step-by-step explanation:
Expand L side to get 
4n -12   -2n  <  -10 + 2n     simplify L side
2n -12   <  -10 +2n      subtract 2n from both sides
<u>-12 < -10 </u>    <===== so the equation is true for ALL n 
(-∞  ,  + ∞ )