Google is now a graphing calculator. Enter the equation in the search bar and you get your graph. You can even do multiple functions, just separate them by a comma. You can also zoom and pan in the graphs.
Here's a screen shot of a quick one I did: y = 4x + 5
According to Google, "This feature covers an extensive range of single variable functions including trigonometric, exponential, logarithmic and their compositions, and is available in modern browsers."
Pretty cool stuff! Math and science students can use this for graphing instead of a graphing calculator for quick graphs.
