*x-axis*and the vertical axis is called

*y-axis*. The point where these 2 axes cross together is called

*origin*.

*Figure 1: Cartesian coordinate system*

A point in the coordinate system is represented by a coordinate pair *(x, y)*. The x and y value represent the distances along each axis.

Those who have experience in gaming most probably has experience in 3-dimension as well. Cartesian coordinate system in 3D world needs another axis – *z-axis*. Z-axis is along side the line that passes through the screen to our eyes.

*Figure 2: 3D coordinate system*

To represent a line in 2D Cartesian, a function consist of variables can be introduced. In general, a straight line in *x* and *y* coordinate system can be represented by

*y = mx + c*

where *y* and *x* are the values represents the point while *m* is the gradient of the straight line and *c* is the *y* value where the straight line intercept to *y*-*axis*.

Example:

*Figure 3: y = 3x + 2*

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