Cartesian coordinate 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 xaxis and the vertical line is called yaxis
A good real life example of a vertical number line or yaxis is a thermometer.
Notice that it has 4 quadrants.
In quadrant I, x and y are positive
In quadrant II, x is negative, but y is positive
In quadrant III, x and y are negative
In quadrant IV, x is positive, but y is negative
The center, or intersection of the two axis is equal to (0,0)
In this lesson, you will learn to plot points on the cartesian coordinate system.
A point is represented by a pair of numbers (x, y)
x stands for any value on the xaxis and y stands for any value on the yaxis
An example of a point is (1, 5)
Let us now plot some points.
Locate point (2,3).
x = 2 and y = 3
Draw a vertical line at x = 2 and draw a horizontal line at y = 3
Where the two lines meet or intersect, is your point (in red)
Locate point (3, 1)
Draw a vertical line at x = 3 and draw a horizontal line at y = 1
The intersection of the two lines is your point
Locate point (4, 4)
Draw a vertical line at x = 4 and draw a horizontal line at y = 4
Tricky cases are when points are located on the xaxis or the yaxis.
Students usually get confused, so study the following two examples carefully
Locate point (2,0)
Draw a vertical line at x = 2 and draw a horizontal line at y = 0.
Notice that when y = 0, your horizontal line is on the xaxis
Important point to remember:
When y = 0, your point is always located on the xaxis
Locate point (0, 3)
Draw a vertical line at x = 0 and draw a horizontal line at y = 3.
Notice that when x = 0, your vertical line is on the xaxis
Important point to remember:
When x = 0, your point is always located on the yaxis
Other examples:
Take the quiz below about Cartesian coordinate system.

Jan 20, 20 03:17 PM
Topnotch information for those who want to become a high school math teacher. All important stuff that you need to know before making a move can be found right here on this website.
Read More
New math lessons
Your email is safe with us. We will only use it to inform you about new math lessons.