Inequalities: Symbols and Vocabulary
Inequalities: Symbols and Vocabulary
Algebra rules / General Rules: Isolate a positive x on the left side using algebra Reverse the inequality sign when mult/divide by a negative
Less than: The symbol that:
< ) ]
Looks like an L () for ess than
Points to the Left Caps the arrow pointing towards smaller numbers
on the number line Points towards the smaller of two numbers (4 < 7)
> Greater than: The symbol that: Looks like the top of an R ( >)for GReater than
> (
Points to the Right
[
Caps the arrow pointing towards larger numbers on
the number line
Open end is by the larger number (7 > 4)
Compound inequalities: usually in the form -4 < x < 4 but can also be x > -4 and x < 4
CTunstall/Inequality Vocabulary.doc/8/10/12
Union / Intersection Guidelines
Union The symbol that:
Looks like a U for nion (not intersection)
Resembles a smile Smiles because it you get a greater amount Corresponds to the greater than (>) inequality
"GreatOR"
Intersection The symbol that: Looks like an A for nd (not or)
Resembles a frown Frowns because it you get less Corresponds to the less than ( (greater than) more than above over greater / larger than exceeds / increased longer than is higher than
(less than or equal to) at most maximum bottom is no more than
(not equal to) is not equal to is not the same as is different / differs from
(greater than or equal to) at least minimum top is no less than
Compound inequality phrases:
between
above phrases joined by "and"
within
above phrases joined by "or"
CTunstall/Inequality Vocabulary.doc/8/10/12
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