Coordinates are points plotted on a grid.

A grid normally has two axis. The **x-axis** which runs **across**, and the **y-axis** which runs **up**.

**Coordinates** are points whose position is defined by the numbers along these axis.

They have two values **‘x’ and ‘y’**, written like this:

(x,y)

The **x value comes first** and **then the y**. Which makes sense as this is how they sit in the alphabet.

X and Y will usually be numbers such as:

(2,4)

This means **2** along the x-axis. **4** up the y-axis.

X is across. Y is up.

To help you remember here is a phrase to learn:

Along the corridor then up the stairs.

If you can remember the phrase it helps you to remember that **‘X’ comes first** – this is along the corridor, **‘Y’ comes second** – up the stairs.

Here is a grid with 3 points a, b and c plotted on it:

Look at point ‘a’, it is located at 1 on the x-axis and 2 on the y-axis.

So it’s coordinates are:

(1,2)

Point ‘b’ is located at 2 on the x-axis and 5 on the y-axis.

So it’s coordinates are:

(2,5)

Point ‘c’ has the coordinates:

(5,1)

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