x-axis, y-axis and Coordinates

In this lesson, you’ll see how to describe the position of a point on a grid using a pair of numbers.

In the diagram below there is a numbered horizontal line, called the x-axis.

And a numbered vertical line, called the y-axis.

Using this arrangement we can describe the position of points using coordinates.

What are Coordinates?

The coordinates of a point is a pair of numbers, in brackets, which describe the position of a point.

For example, to find the point (4,7) you would go 4 units to the right of the origin (this is where your two axes meet) and 7 units up.

You can see the point below in red.

Labelled Points

Similarly, the point labelled A below will have coordinates (12,1).

The point labelled B below will have coordinates (6,0).

And the point labelled C below will have coordinates (0,8).

Take the Test

Enter coordinates in the correct format, separated by a comma and enclosed by brackets.

Like this:  (3,4)

Now give the coordinates of these points:

Welcome to your Coordinates Quiz

Give the coordinates for question A
Give coordinates for question B
Give coordinates for question C
Give coordinates for question D
Give the coordinates for question E
D, E, C and F form a rectangle. What are the coordinates of F?

Key Points of this Lesson:

  • The grid used is numbered horizontally (on the x-axis) and also vertically (the y-axis). Where they meet is called the origin
  • A point is described by two numbers in brackets called coordinates
  • The first coordinate of a point is the number of units to the right of the origin and the second coordinate is the number of units moved upwards

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