SOLUTION: 9 – 4a ≤ -3

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Question 223619: 9 – 4a ≤ -3
Answer by checkley77(12569) About Me  (Show Source):
You can put this solution on YOUR website!
9 – 4a ≤ -3
-4a<=-3-9
-4a<=-12
a>=-12/-4 (note: when dividing by a negative value the < sign changes to a > sign).
a>=3 ans.
Proof:
Let a=3.1
9-4*3.1<=-3
9-12.4<=-3
-3.4<=-3