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Axis Plural Axes: Definition and Example | EDU.COMEDU.COMResourcesBlogGuidePodcastPlanBackHomesvg]:size-3.5">Math Glossarysvg]:size-3.5">Axis Plural AxesAxis Plural Axes: Definition and ExampleTable of ContentsUnderstanding Axes in Mathematics Definition of Axes

In mathematics, an axis (plural: axes) is a reference line used in a coordinate system to locate points in space. Axes help us find the exact position of points by providing a consistent way to measure distances and directions. The most common coordinate system is the Cartesian coordinate system, which uses two perpendicular axes in 2-dimensional space: the horizontal axis (called the x-axis) and the vertical axis (called the y-axis). In 3-dimensional space, we add a third axis (the z-axis) that extends outward from the point where the x and y axes meet.

Axes divide the coordinate plane into regions called quadrants. The point where the axes intersect is called the origin, which has the coordinates (0, 0) in a 2-dimensional system. The positive x-axis extends to the right of the origin, while the positive y-axis extends upward from the origin. Values on the axes help us measure distances from the origin, with positive numbers going in the positive directions and negative numbers going in the negative directions. This system gives every point in the plane a unique address described by its coordinates.

Examples of Axes Example 1: Locating Points on the Coordinate Axes Problem:

Give some examples of the coordinates of points that lie directly on the axes in a coordinate plane: point A on the positive x-axis, point B on the negative y-axis, and point C on the negative x-axis. 

Step-by-step solution:

Step 1, Remember that points on the x-axis always have a y-coordinate of 0.

Step 2, Points on the y-axis always have an x-coordinate of 0.

Step 3, For point A on the positive x-axis, let's use the coordinates (5, 0). Point A on the Positive x-axis

Step 4, For point B on the negative y-axis, the coordinates would be (0, -3). Point B on the Negative y-axis

Step 5, For point C on the negative x-axis, the coordinates would be (-4, 0). Point C on the Negative x-axis

Step 6, So we can use these examples: A(5, 0), B(0, -3), and C(-4, 0).

Example 2: Identifying Axes on Graphs Problem:

A student is creating a graph showing the number of books read each month. How to decide which axis represents the number of books, and which represents the months?

Step-by-step solution:

Step 1, In graphs, we need to identify what each axis represents.

Step 2, Generally, the horizontal axis (x-axis) represents the independent variable, which is the input or what we're measuring over.

Step 3, The vertical axis (y-axis) typically represents the dependent variable, which is the output or what we're measuring.

Step 4, In this graph, the months are the independent variable because time flows naturally, and the number of books read depends on the month.

Step 5, So the horizontal axis (x-axis) should represent the months of the year. The vertical axis (y-axis) should represent the number of books read each month. Number of Books by Month

Example 3: Number Lines as Single Axes Problem:

Plot the numbers -2, 0, and 3 on a number line.

Step-by-step solution:

Step 1, A number line is a single axis that shows numbers in order from left to right.

Step 2, Start by drawing a straight line with equally spaced tick marks for whole numbers.

Step 3, Label the tick marks with integers, making sure 0 is in the middle, positive numbers are to the right, and negative numbers are to the left.

Step 4, To plot -2, find the tick mark labeled -2, which is 2 units to the left of 0.

Step 5, For 0, use the tick mark at the origin (middle) of the number line.

Step 6, For 3, find the tick mark labeled 3, which is 3 units to the right of 0.

Step 7, Mark each point with a dot at its proper position on the number line. Numbers Plotted on a Number Line

Comments(8)MMarketerSallyNovember 5, 2025I've used this axis plural axes def for my students. It made explaining graphing so much easier! Thanks for the clear info.

DDirectorFinnNovember 5, 2025I've used this glossary entry to explain axes to my students. It's clear and the example really helped them grasp the concept!

DDoctorFrankNovember 4, 2025This glossary def of axis plural axes is great! I've used it to help my students grasp graph concepts. Clear and easy to understand.

MCMs. CarterSeptember 17, 2025This explanation of axes was super helpful for my kid! We used the graphing example to plot points together, and it really made the Cartesian plane click for them. Great resource!

MCMs. CarterSeptember 10, 2025I used the Axis Plural Axes page to help my kids understand coordinate geometry, and it made plotting points on the Cartesian plane so much easier for them. Clear examples really help!

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