Algebra I
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variable
symbol used to represent a number

values of the variable
numbers the variable can equal

domain
set of numbers the variable can equal

variable expression
mathematical expression that names a specific number

simplify a numerical expression
replace the expression with the simplest name for the value

substitution principle
an expression may be replaced by another expression that has the same value

conventions
things we agree to

evaluating a variable expression
means replacing the variable with a specific value then simplifying the resulting numerical expression

order of operations
rules to simplify expressions with more than 2 numbers

grouping symbols
symbols used to show expressions that should be simplified

equation
sentence formed by placing = between 2 expressions

open sentence
an equation containing a variable

statement
a sentence that is either true or false but not both

Formula for Area of rectangle
A=lw length x width

formula for perimeter of rectangle
P=2l + 2w 2 x length + 2 x width

formula for distance traveled
D=rt rate x time traveled

formula for cost
C=np number of items x price of an item