Algebra I Core Vocabulary

Grade 9 · Math · Flashcards

Master the essential vocabulary terms that form the foundation of Algebra I.

Flashcards

Variable: A symbol (usually a letter) that represents an unknown or changing quantity.
Coefficient: The numerical factor multiplied by the variable in a term (in 3x, the coefficient is 3).
Constant: A term with a fixed numerical value that does not contain a variable.
Expression: A mathematical phrase combining numbers, variables, and operations — no equal sign.
Equation: A mathematical statement that two expressions are equal, containing an equal sign.
Solution: The value(s) of a variable that make an equation true.
Linear Equation: An equation whose graph is a straight line; highest variable exponent is 1.
Slope: The rate of change of a line; rise over run (Δy/Δx).
Y-Intercept: The point where a line crosses the y-axis; the value of y when x = 0.
Inequality: A mathematical statement showing that two expressions are not equal, using <, >, ≤, or ≥.
Domain: The set of all possible input values (x-values) for a function.
Range: The set of all possible output values (y-values) for a function.
Function: A relation where each input has exactly one output; passes the vertical line test.
Distributive Property: a(b + c) = ab + ac; multiply the outside term by each term inside the parentheses.