# 1.13: Functions on a Cartesian Plane

Difficulty Level: Basic Created by: CK-12
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Practice Functions on a Cartesian Plane

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Estimated8 minsto complete
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Estimated8 minsto complete
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### Vocabulary Language: English Spanish

TermDefinition
quadrant A quadrant is one-fourth of the coordinate plane. The four quadrants are numbered using Roman Numerals I, II, III, and IV, starting in the top-right, and increasing counter-clockwise.
Cartesian Plane The Cartesian plane is a grid formed by a horizontal number line and a vertical number line that cross at the (0, 0) point, called the origin.
Coordinate Plane The coordinate plane is a grid formed by a horizontal number line and a vertical number line that cross at the (0, 0) point, called the origin. The coordinate plane is also called a Cartesian Plane.
Function A function is a relation where there is only one output for every input. In other words, for every value of $x$, there is only one value for $y$.

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