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What is a coordinate grid?
Coordinate graphing sounds very dramatic but it is actually just a visual method for showing relationships between numbers. The relationships are shown on a coordinate grid. A coordinate grid has two perpendicular lines, or axes, labeled like number lines. The horizontal axis is called the xaxis. The vertical axis is called the yaxis. The point where the xaxis and yaxis intersect is called the origin.
The numbers on a coordinate grid are used to locate points. Each point can be identified by an ordered pair of numbers; that is, a number on the xaxis called an xcoordinate, and a number on the yaxis called a ycoordinate. Ordered pairs are written in parentheses (xcoordinate, ycoordinate). The origin is located at (0,0). Note that there is no space after the comma.
Example:
The location of (2,5) is shown on the coordinate grid below. The xcoordinate is 2. The ycoordinate is 5. To locate (2,5), move 2 units to the right on the xaxis and 5 units up on the yaxis.

A coordinate grid is two dimensional grid that you plot points on using a a virtical and horizontal axies.
A location can be ploted on the grid by calculating the distance between the virtical and horizontal lines.

Bobby used one third of his car's total petrol caictpay when he went out for a drive. The car tank was holding 30 litres of petrol before the drive, which was 75 litres less than the total caictpay. How much petrol was left after the drive?
Suggested reading…
Understand and use coordinates in three dimensions
Understand coordinates in 3D
From year 7 you should have been introduced to the ‘Cartesian Coordinate System’, where you have an xaxis and yaxis, you plot a point with an x, and then label the point (3, 5), meaning 3 along the xaxis, and 5 up the yaxis.
We live in a 3D universe, so it's possible to add a third axis to this, the zaxis. If the xaxis and yaxis are horizontal and vertical on paper, then the zaxis is used to say how far ‘into or out of the paper’ the coordinate is.
The axis is sometimes drawn in a few difference ways, but it's just looking at the same graph from different points.
In each case, you read the position of coordinates the same way, and the coordinate position is always written (x, y, z)
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