Vertical line test
A set of points on a rectangular coordinate system is the graph of $y$ as a function of $x$ if and only if no vertical line intersects the graph at more than one point.
Vertex
The point at which two or more border lines of a region intersect.
Verbal mathematical model
Words that describe how real-life values are related. Verbal models can be expressed using math symbols.
Variables
A collection of letters used in combination with constants using addition, subtraction, multiplication, or division to create an algebraic expression.
Variable factors
The variable part of a term. $ab$ in $6ab$.
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