Graphs of Equations

FIU has online movies to help with this topic on this page. You must have QuickTime Player, a free download, installed on your computer.
For a slower progression through the concepts of rectangular coordinates you may watch the following movies:
Finding intercepts is movie 3.12 on this page.
Determining whether or not a point lies on a graph is movie 3.5 on this page.

The University of Idaho provides another online resource.  These lectures are only viewable by those with DSL or cable modems.  Real Player, a free download, is required to see these videos.  The videos cover the topics below. To see the videos, go to this page and look under section 2.2.
Graphing equations by plotting points
Finding x and y intercepts
Symmetry

More online help:
Finding intercepts
Symmetry

Problems 27-32 in section 2.2 ask you to determine whether or not a point lies on the graph of an equation. To answer these questions, just substitute the coordinates of the point into the equation.  If the result is a true sentence, then the answer is “yes the point lies on the graph.” If the result is a false sentence, then the answer is “no the point does not lie on the graph.”