SOLUTION: Solve using the multiplication principal. -3x<-12 The solution is {x|x _ _}

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Question 158279: Solve using the multiplication principal.
-3x<-12
The solution is {x|x _ _}
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
-3x%3C-12+ Start with the given inequality


cross%28%28-1%2F3%29%28-3%29%29x%3E-12%28-1%2F3%29+ Multiply both sides by -1%2F3 (which is the multiplicative inverse of -3) to isolate "x".

Note: multiplying both sides by a negative number will change the sign from a "less than" sign to a "greater than" sign.


x%3E%28-12%29%2F%28-3%29+ Multiply


x%3E4+ Reduce



So the solution set is


Also the answer in interval notation is


Here's the graph of the solution set

Note: the endpoint is an open circle