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Notes for Week 7 Name: ______________________________
MAT 0024C
Chapter 4: Graphing Linear Equations and Inequalities
4.1 The Rectangular Coordinate System
The Rectangular Coordinate System
A rectangular coordinate system is formed by two perpendicular number
lines. The horizontal number line is usually called the x-axis and the
vertical number line is usually called the y-axis.
The point where the axes intersect is called the origin.
The axes form a coordinate plane, and they divide it into four regions
called quadrants, which are numbered using Roman numerals as shown
below:
Each point in a coordinate plane can be identified by an ordered pair of
real numbers x and y written in the form (x,y). The first number x in the
pair is called the x-coordinate, and the second number y is called the y-
coordinate.
The process of locating a point in the coordinate plane is called graphing
or plotting the point.
1
Examples:
Q: Plot each point and state the quadrant i...

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