# The Coordinate Plane

To simplify the coordinate plane, take a look at the map below. There are three very important images we need to identify.

 Identify our ship - The Black Pearl Find the location of the treasure Locate the other ship on the water

The general purpose of a coordinate plane is to help us easily identify an object on a map. in this case, the two ships and the treasure chest.

Take a look at the update map with the lines drawn in. The lines form a grid - it looks like a piece of graph paper was placed on top of our map.

• With these lines in place, it is now much easier to explain exactly where the treasure and the other ship are located

 Using the Grid - How it is Helpful

The best way to use these lines is to think of them as roads that you drive on. The distance between each line is known as one unit - units can be 1 inch, 1 foot, 1 mile, 1 centimeter, or any other means of measurement.

How many units do we have to travel from the Black Pearl to the treasure chest. Let's take a look.

Notice the red lines drawn into the map. The Black Pearl starts underneath the #5 line and then travels to the treasure chest under the #2 line. How far did it travel? In what direction did it go?

Answer: 3 units to the west (left)

Do you see how this is much easier to determine distance (and location) once the grid is draw in? This grid, with the two black arrows and faint grey lines, is what is known as the coordinate plane. It is also referred to as the Cartesian Coordinate System (learn more about Rene Descartes).

 Take a look at the intersection (the place where they cross) of the two black line with arrows. The big red arrow at the bottom is pointing to it because it is very important. This special spot on our map, or coordinate plane, is known as the origin. The origin is always the starting point, where you originate. Think of this as the place that you dock your ship. Every time you go out you must start from the dock (origin)!

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