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5 Cards in this Set
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Properties of negatives

1.  (X)= X
2. (x) = (y)= (x+y) 3. x  y = x = (y) 4. (1)x= x (x)y = x(y) = xy (x)(y)= xy 5. x/y = x/y =  x/y provided y does not equal 0 

absolute value

if x is a real number
x = x if x > 0 x = x if x < 0 

distance between two points

if a and b are coordinates of two points on a number line, then the distance between those points is given by the formulas
d= a  b or d= ba 

the trichotomy property

for any two real numbers a and b, exactly one of the following relationships must hold:
a = b or a<b or a>b 

properties of equality

if a, b, and c are real numbers, then
a =a (reflexive property) if a=b, then b=a (symmetric property) if a=b and b=c then a=c (transitive property) 