Inequailities (1 Viewer)

[mrcalkin]

when does the "<" and ">" change as in flip ("<" to ">"). Something to do with minus. Can someone please tell me the rule so i can refresh my memory.

 

[x3.eddayyeeee]

multiplying/dividing by a negative number
taking the recipricol of both sides.
.
both require you to change direction of the inequality sign.

 

[99uaifohshiz]

whenever you multiply or divide by a negative number..
you MUST flip the sign around, otherwise if you substitute a number into x.. or whatever inequality... it wont be true for both inequalities (the original AND the one that you multiplied a negative number with). ill give you an example...

THE RIGHT WAY

x > 1
(mutiply both sides by negative 1)
-x < -1

you can easily check, by subbing any number into x to prove it.

let's substitute x = 2 (since x is always greater than one.. from x>1)
therefore, 2 > 1.
now, sub it into the second inequality..
-2 < -1
which is also correct (since -1 is always greater than -2!)

good luck

 

[99uaifohshiz]

asian expectations?
as if dude!
asian expectations: 99 +

good luck

 

[mrcalkin]

thanks guys for your help

 

[GUSSSSSSSSSSSSS]

lol wen i clicked on this i expected somethin different

but yeh 99fohshiz just forgot about when reciprocating both sides you also gotta swap the direction

but i think sumone already covered that