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# Algebra

### Algebra Vocabulary

TermDefinition
Variable A symbol that represents a quantity that can vary.
Constant A symbol that represents a specific number (a quantity that does not vary).
Counting Numbers Natural numbers such as 1, 2, 3, 4, 5 ...
Integers Includes counter numbers and other number such as ..., -3, -2, -1, 0, 1, 2, 3, ...
Rational Numbers Numbers that can be written in the form n/d where n and d are integers and d is not zero
Real Numbers All the numbers represented on the number line
Irrational Numbers The real numbers that are not rational.
Average or Mean To find, divide the sum of the numbers by the number of numbers in the group.
Negative Numbers Real numbers less than 0
Positive Numbers Real numbers greater than 0
Scattergram A graph of plotted ordered pairs.
Independent Variable The x axis of a scattergram; happens first
Dependent Variable The y axis of a scattergram, happens second
Linearly related If two quantities of an authentic situation are described accurately by a line.
Model A mathematical description of an authentic situation.
Linear Model A non-vertical line that describes the relationship between two quantities in an authentic situation.
Input A permitted value of the independent variable that leads to at least one output.
Output A permitted value of the dependent variable
Intercepts of a Line Any point where a line and an axis of a coordinate system intersect.
Expression A constant, variable, or a combination of constants, variables, operation symbols, and grouping symbols, such as parenthesis.
Evaluate an Expression We evaluate by substituting a number for each variable in the expressions and then calculating the result.
Division by Zero Division by zero is undefined.
Simplify a Fraction Reducing a fraction to it's lowest common denominator.
Simplify Results If the result of an exercise is a fraction, simplify it.
Created by: slucas302a