2.1
linear (first-degree) equation
in one variable
solution
solution set
equivalent equations
conditional equation
contradiction
identity2.2
mathematical model
formula
percent2.5
inequality
linear inequality in one
variable
equivalent inequalities
three-part inequality2.6
intersection
compound inequality
union2.7
absolute value equation
absolute value inequalityKEY TERMS
1° one degree infinity
ˆ negative infinity
ˆ the set of real
numbers1 ˆ,ˆ 2 set intersection
ª set unionº
NEW SYMBOLS
1.Analgebraic expressionis
A.an expression that uses any of the
four basic operations or the
operation of raising to powers or
taking roots on any collection of
variables and numbers formed
according to the rules of algebra
B.an equation that uses any of the
four basic operations or the
operation of raising to powers or
taking roots on any collection of
variables and numbers formed
according to the rules of algebra
C.an equation in algebra
D.an expression that contains
fractions.
2.Anequationis
A.an algebraic expression
B.an expression that contains
fractions
C.an expression that uses any of the
four basic operations or the
operation of raising to powers or
taking roots on any collection of
variables and numbers formed
according to the rules of algebra
D.a statement that two algebraic
expressions are equal.3.Theintersectionof two sets AandB
is the set of elements that belong
A.to both AandB
B.to either AorB, or both
C.to either AorB, but not both
D.to just A.
4.Theunionof two sets AandBis the
set of elements that belong
A.to both AandB
B.to either AorB, or both
C.to either AorB, but not both
D.to just B.TEST YOUR WORD POWER
See how well you have learned the vocabulary in this chapter.
ANSWERS
SUMMARY
CHAPTER 2
1.A;Examples: 2.D;Examples: 3.A;Example:If and
B= 5 1, 2, 3 6 ,thenA ̈B= 526. 4.B;Example:Using the sets AandBfrom Answer 3, A ́B= 5 1, 2, 3, 4, 6, 8 6.
3 y 2 - (^1) , 6+ 22 x, 4a (^3) b-c 2 a+ 3 =7, 3y=-8,x (^2) = 4 A= 5 2, 4, 6, 8 6