# Where the x and y axes meet

### MathSteps: Grade 4: Coordinate Graphing: What Is It?

Coordinates on this system are located by their distance from perpendicular lines (the x and y axes) that intersect. Every line, figure and point in. Where the x and y axes meet -- Find potential answers to this crossword clue at propagacni.info The horizontal axis in the coordinate plane is called the x-axis. The vertical axis is called the y-axis. The point at which the two axes intersect is called the origin.

The choices of letters come from the original convention, which is to use the latter part of the alphabet to indicate unknown values. The first part of the alphabet was used to designate known values. A Euclidean plane with a chosen Cartesian coordinate system is called a Cartesian plane.

In a Cartesian plane one can define canonical representatives of certain geometric figures, such as the unit circle with radius equal to the length unit, and center at the originthe unit square whose diagonal has endpoints at 0, 0 and 1, 1the unit hyperbolaand so on.

The two axes divide the plane into four right anglescalled quadrant. The quadrants may be named or numbered in various ways, but the quadrant where all coordinates are positive is usually called the first quadrant. If the coordinates of a point are x, ythen its distances from the X-axis and from the Y-axis are y and xrespectively; where The tick marks on the axes are one length unit apart.

### The Coordinate Plane

A Cartesian coordinate system for a three-dimensional space consists of an ordered triplet of lines the axes that go through a common point the originand are pair-wise perpendicular; a orientation for each axis; and a single unit of length for all three axes. As in the two-dimensional case, each axis becomes a number line. For any point P of space, one considers a plane through P perpendicular to each coordinate axis, and interprets the point where that plane cuts the axis as a number.

The Cartesian coordinates of P are those three numbers, in the chosen order. The reverse construction determines the point P given its three coordinates. Alternatively, each coordinate of a point P can be taken as the distance from P to the plane defined by the other two axes, with the sign determined by the orientation of the corresponding axis.

## Cartesian coordinate system

Each pair of axes defines a coordinate plane. These planes divide space into eight trihedracalled octants. Thus, the origin has coordinates 0, 0, 0and the unit points on the three axes are 1, 0, 00, 1, 0and 0, 0, 1. There are no standard names for the coordinates in the three axes however, the terms abscissa, ordinate and applicate are sometimes used. The coordinates are often denoted by the letters X, Y, and Z, or x, y, and z.

### Coordinate system and ordered pairs (Pre-Algebra, Introducing Algebra) – Mathplanet

The axes may then be referred to as the X-axis, Y-axis, and Z-axis, respectively. At the right is a graph with two points, B and D. The x-coordinate of point B is The x-coordinate of point D is Identifying the y-coordinate As we already mentioned, each point is defined by two coordinates, the x and the y coordinate. Now that you know how to find the x-coordinate of a point, you have to be able to find the y-coordinate.

The y-coordinate of a point is the value that tells you how far from the origin the point is on the vertical, or y-axis. To find the y-coordinate of a point on a graph: Draw a straight line from the point directly to the y-axis. The number where the line hits the axis is the value of the y-coordinate.

## Coordinates

Looking back at the graph with our points B and D, we now identify the y-coordinate for each. The y-coordinate of point B is The y-coordinate of point D is Notation for Identifying Points Once you have the coordinates of a point you can use the ordered pair notation for labeling points.

The notation is simple. Points are identified by stating their coordinates in the form of x, y.

Note that the x-coordinate always comes first. For example, in the figure we've been using, we have identified both the x and y coordinate for each of the points B and D. Coordinates of point B areThe x-coordinate of point D is Coordinates of point D arePoints On The Axes If a point is lying on an axis, you do not need to draw lines to determine the coordinates of the point.

In the figure below, point A lies on the y-axis and point C lies on the x-axis.

When a point lies on an axis, one of its coordinates must be zero. Point A--If you look at how far the point is from the origin along the x-axis, the answer is zero.

Therefore, the x-coordinate is zero. Any point that lies on the y-axis has an x-coordinate of zero. If you move along the y-axis to find the y-coordinate, the point is from the origin. The coordinates of point A are 0, Point C--If you look at how far the point is from the origin along the y-axis, the answer is zero.

Therefore, the y-coordinate is zero. Any point that lies on the x-axis has a y-coordinate of zero. If you move along the x-axis to find the x-coordinate, the point is from the origin. The coordinates of point C are0 Example Which point is on the y-axis? Which point is labeled 20, 60? Which point s have a y-coordinate of 30?

Answers to Example Which point is on the y-axis?