Coordinate System
and Graphing
Ordered Pairs and
Relations
• Points on a coordinate plane
can be located by using pairs
of integers. Integers are
positive and negative #’s.
The coordinate plane
consists of the following:
1) a horizontal axis (left to
right) which is called the
x-axis
2)a vertical axis (up and
down) which is called the
y-axis
3) the origin, (0, 0), where the
x- and y- axis cross or
intersect
4) an infinite set of ordered
pairs or points. Points are
named by using capital letters
and given location by using
ordered pairs. The ordered
pair corresponds to location on
the x- and y- axis.
For example,
• Point A is located at (x, y). To
graph this point you start at the
origin and move to the right (if x is
positive) or left (if x is negative).
Then, from that location, move up
(if y is positive) or down (if y is
negative). Place a point on the
coordinate plane and label with the
capital letter, A.
• 5) four regions called
quadrants.
• Quadrant I: (+x, +y)
• Quadrant II: (-x, +y)
• Quadrant III: (-x, -y)
• Quadrant IV: (+x, -y)
• A point is located in or on:
Q1, Q2, Q3, Q4, origin,
x-axis, or the y-axis
(Most textbooks or handouts
only ask which quadrant. You
need to choose from the
above 7 locations.)
Practice (If you have the Internet, check out
some of these websites. We will probably look
at some in class too.)
• http://www.glencoe.com/sec/math/prealg/prealg05/e
xtra_examples/chapter2/lesson2_6.pdf
• lhttp://www.math.com/school/subject2/practice/S2
U4L1/S2U4L1Pract.html
• http://www.shodor.org/interactivate/activities/Gene
ralCoordinates/
• http://www.mste.uiuc.edu/pavel/java/chameleon/adva
nced/index.htm
• http://www.glencoe.com/sec/math/studytools/cgibin/msgQuiz.php4?isbn=0-07-8252008&chapter=2&lesson=6&&headerFile=6&state=nc
• http://hotmath.com/help/gt/genericalg1/section_2_1
.html
• http://www.funbrain.com/cgi-bin/co.cgi