Expressions, Equations & Inequalities
The number in front of a variable
Coefficient
A relation where every input (x-value) has exactly one output (y-value).
Function:
A polynomial with three terms (e.g., (ax^2 + bx + c).
Trinomial
An equation in the form Ax + By = C
Standard Form
The average of a data set.
Mean
Numbers, variables, or the product of both, separated by addition or subtraction.
Term
The set of all possible input values (usually x).
Domain
The U-shaped graph of a quadratic function.
Parabola
A set of two or more equations with the same variables.
System of Equations
The exact middle number of a sorted data set.
Median
A fixed number that does not change.
Constant
The set of all possible output values (usually y).
Range:
The maximum (highest) or minimum (lowest) turning point of a parabola.
Vertex
Solving a system by replacing one variable with an equivalent expression.
Substitution Method
The range of the middle half of data; calculated as Q3 - Q1.
Interquartile Range (IQR)
A mathematical phrase that contains numbers, variables, and operation symbols.
Algebraic Expression
The point where a line crosses the y-axis, where x = 0.
Y-intercept (b)
The imaginary vertical line that divides a parabola into two symmetrical halves (Formula: x = -b/2a).
Axis of Symmetry
Solving a system by adding or subtracting equations to cancel out a variable.
Elimination Method
The organization of the frequency of data represented by individual dots.
Dot plot
A mathematical sentence comparing expressions using symbols like <, >, etc.
Inequality
The equation y = mx + b
Slope-Intercept Form
The value under the radical in the quadratic formula: b^2 - 4ac. It determines the number of solutions.
Discriminant
Occurs when lines are parallel and never intersect.
No Solution
A number from -1 to 1 that measures how well a line fits the data (e.g., r = 1 is a strong positive correlation).
Correlation Coefficient (r)