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Home Q & A Board Science-Related Homework Help Mathematics
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microdavid microdavid
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12 years ago
Now I have the answer, but my question is when solving for the variable, do I ever have to reverse the middle sign?

6x+10(greater and equal than) 13x+31
My answer is -3(greater and equal than) x

Do I have to flip the the greater and equal than?
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6 Replies
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wrote...
#1
12 years ago
you only have to do this if you divide or multiply by a negative number while you are solving
wrote...
#2
12 years ago
no becasue you never multiply by a negative #
wrote...
#3
12 years ago
You only have to switch the middle sign if you multiply or divide by a negative number
6x+10 > or = 13x+31
6x > or = 13x+21
-7x > or = 21
x < or = -3

x is less than or equal to -3
wrote...
#4
12 years ago
you only have to flip the sign when you multiply or divide by  a negative number
wrote...
#5
12 years ago
the only time you reverse the signs is when you multiply or divide by a negative number.  For example:
 -2x greater than or equal to 50
  -2x/(-2) less than or equal to 50/(-2)
     x      less than or equal to -25


another example:        -1/2 x less than or equal to -30
                             -2(-1/2) x greater than or equal to -2(-30)
                                        x greater than or equal to 60
Answer accepted by topic starter
_biology_biology
wrote...
#6
12 years ago
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