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View Full Version : How to graph f(x)=2x, if x>0?


lizama15
Sep 30, 2010, 08:10 PM

Unknown008
Sep 30, 2010, 11:00 PM
One of the simplest ways is to find some points on the graph.

In your case, you get the points (0,0), (1,2), (2,4), etc.

Now, you draw a line on those points.

Now, we consider the restriction. X should be greater than 0. You erase any part of the graph where x is negative and put a small circle (like in plotting a coordinate) around the point where x = 0. This will mean that the graph starts at zero, exclusive and continues upwards on the line y = 2x.

Here's an example:

http://p1cture.me/images/28124199657601053843.gif