# Homework Help: Trouble graphing and working out functions

1. Mar 5, 2005

### Solidmozza

Hi everyone.
Im on a bit of a time crunch, so all advice ASAP would be greatly appreciated.
Im usually quite good at maths, am In High School, and we are doing functions. In particular, im having trouble graphing and working out functions like the following type:
Eg Graph the following, y = 1/(x*2+1)
or Graph the following, y = x + 1/x
Any help in a technique on how to do these types of problems, ASAP, would be greatly appreciated.
Thanks!

2. Mar 6, 2005

### moose

If you get stuck, just make a t-chart :D
I'm totaly serious though, if you ever forget how a certain graph looks, just plug in a few sample points.

3. Mar 6, 2005

### xanthym

Basic technique is to start with x-intercepts, y-intercepts, x-asymptotes, and y-asymptotes, and then fill in between by calculating and graphing some individual (x,y) point values (where needed until the graph seems complete). The first URL below presents a good review of this technique. The 2nd URL provides an on-line grapher from your browser to quickly graph most simple algebraic functions. (Instructions for its use are below the graph display.)
http://www.wiu.edu/users/mfjro1/wiu/tea/Functions/handouts/graphrat-howto.htm
http://www.math.niu.edu/~apel/applets/numericalAnalysis/graphingApplet/

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Last edited by a moderator: Apr 21, 2017