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.
Figure 3: y = 3x + 2