SOLUTION: i do know how to solve the inequality which is -7x + 3 < -18 -7x<-18-3 -7x<-21/-7 x=3 my question is should i flip the sign or not. if so why? Thanks for your help

Algebra ->  Equations -> SOLUTION: i do know how to solve the inequality which is -7x + 3 < -18 -7x<-18-3 -7x<-21/-7 x=3 my question is should i flip the sign or not. if so why? Thanks for your help       Log On


   

Question 740521: i do know how to solve the inequality which is
-7x + 3 < -18
-7x<-18-3
-7x<-21/-7
x=3 my question is should i flip the sign or not. if so why?
Thanks for your help


















Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
i do know how to solve the inequality which is
-7x + 3 < -18
-7x<-18-3
-7x<-21/-7
x=3 my question is should i flip the sign or not. if so why?
-------------
You "flip the sign" when you multiply/divide by a negative.
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Here's why:
-7x<-21/-7
==============
-x < -3
Add 3
-x + 3 < 0
Add x
3 < x
That's the same as
x > 3
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Flipping the sign is a shortcut.