Question 196337: i dont understand how to do this problem:
-2/3x<20
ive been workin at it almost all day im really dont understand it
Found 2 solutions by RAY100, edjones:
Answer by RAY100(1637)   (Show Source):
You can put this solution on YOUR website! -2/3 x < 20
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multiply thru by +3/2
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-x < 3*20/2
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-x < 30
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Remember when we multiply (or divide) an inequality by (-1) ,,,,
we must flip (change) inequality sign.
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multiplying by (-1) thru out
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x> -30,,,,,,answer
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checking
for x= -29,,,,(# larger than -30),,,,,, -2/3 (-29) < 20 ,,,,,,, +19.33 < 20,,,,,ok
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for x=-30,,,,,(# = - 30),,,,,-2/3 (-30) <20,,,,,,,,+ 20 < 20,,,, no but equal
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for x = -31,,,,,(# smaller than -30),,,, -2/3 (-31) <20 ,,,,, + 20.67 < 20,,,, no
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Answer by edjones(8007)  (Show Source):
You can put this solution on YOUR website! (-2/3)x<20 I assume that this is the problem.
-2x/3<20
-2x<60
x>30 remember to reverse the inequality sign when dividing by a negative number.
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Ed
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