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# Equations

### Vocabulary for Algebra I - Equations/Proportions/Formulas

constant a value that does not change
expression a mathematical phrase that contains operations, numbers, and/or variables
order of operations a process for evaluating expressions - Parentheses/Exponents/Multiply/Divide/Add/Subtract
variable a symbol used to represent a quantity that can change
equation mathematical statement that two expressions are equal
solution of equation a value of a variable that makes an equation true
equivalent equations equations that have the same solution, but may look different
identity an equation that is always true, no matter what value is substituted for the variable
deductive reasoning the process of using logic along with known facts, definitions, and properties to reach a conclusion
ratio the comparison of two quantities - often expressed in a fraction
proportion a statement that two ratios are equal
rate a ratio of two quantities with different units, such as miles/gallon (mi/gal)
unit rate a rate with a second quantity of 1 unit - such as 22 mi/1 gal (22 mi/gal)
cross products (cross multiplying) multiplying diagonally across a proportion
percent a ratio that compares a number to 100
scale a ratio between two sets of measurements (like 1 in:5 mi)
formula an equation that states a rule for a relationship among quantities (like d=rt)
literal equation an equation that has two or more variables
absolute value of a number the number's distance from zero on a number line
Created by: gklee