definition and example of cartesian coordinates system
A Cartesian coordinate system, also known as rectangular coordinate system, can be used to plot points and graph lines. The following is an example of rectangular coordinate system. It is basically, a set of two number lines. The horizontal line is called x-axis and the vertical line is called y-axis. A good real life example of a vertical number line or y-axis is a thermometer. Notice that it has 4 quadrants.