# Algebra I

 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 AuthorLee3 ID167858 Card SetAlgebra I Descriptionchapter 1 Updated2012-08-28T21:52:09Z Show Answers