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# What is a "coordinate plane"?

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According to the Math Planet, a coordinate plane is a two-dimensional number line that is composed of a horizontal line called the x-axis and a vertical line called the y-axis. These two lines are perpendicular with each other and intersect at a point called the origin.

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Math Open Reference states that points, lines and curves can be plotted on a coordinate plane. Moreover, the two axes divide the coordinate plane into four parts called quadrants. The top right part is called the first quadrant and on the top left is the second quadrant. The third quadrant is located below the second quadrant, and the fourth quadrant is below the first quadrant.

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## Related Questions

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A vertical intercept is a point where a line crosses the vertical axis, or y-axis, on the Cartesian coordinate plane. When evaluating a function, the vertical intercept can be found by setting the input, or x value, to zero.

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A coordinate grid is a series of vertical and horizontal lines that form a pattern of squares on the page; each grid line has a number or coordinate. Coordinate grids are useful for graphing positions of numbers to see patterns of lines and curves.

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A line plot involves the distribution of dots on a number line to represent values from a data set. Each dot aligns with a number in the set. Multiple values of the same number mound on top of one another.