Question 23955
If you can sketch the graph, then try to draw a vertical line through the graph in such a way that it crosses the graph two or more times.  If a vertical line crosses the graph in TWO or more points, then the graph is NOT a function.


From the perspective of the equation, if you can write the equation in the form y =(________), with almost anything in the blank space, then it IS a function.  However, if it comes out with a y = +-(_____) (that is a PLUS or MINUS), then it is NOT a function.  If the equation has a y^2 or y^4 or y^ (even power).  then generally, it is NOT a function.


R^2 at SCC