Algebra I

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1. variable
symbol used to represent a number
2. values of the variable
numbers the variable can equal
3. domain
set of numbers the variable can equal
4. variable expression
mathematical expression that names a specific number
5. simplify a numerical expression
replace the expression with the simplest name for the value
6. substitution principle
an expression may be replaced by another expression that has the same value
7. conventions
things we agree to
8. evaluating a variable expression
means replacing the variable with a specific value then simplifying the resulting numerical expression
9. order of operations
rules to simplify expressions with more than 2 numbers
10. grouping symbols
symbols used to show expressions that should be simplified
11. equation
sentence formed by placing = between 2 expressions
12. open sentence
an equation containing a variable
13. statement
a sentence that is either true or false but not both
14. Formula for Area of rectangle
A=lw   length x width
15. formula for perimeter of rectangle
P=2l + 2w     2 x length + 2 x width
16. formula for distance traveled
D=rt      rate x time traveled
17. formula for cost
C=np      number of items x price of an item
 Author: Lee3 ID: 167858 Card Set: Algebra I Updated: 2012-08-28 21:52:09 Tags: Variables grouping equations formulas Folders: Description: chapter 1 Show Answers: