In the old days, you were pretty much limited to a handheld graphing calculator in order to produce graphs of equations. That has all changed in the past few years with the introduction of online graphing calculators.
Enter, in the text area provided above, the function or functions you want to graph. All functions must use x as their independent variable. Enter functions in standard mathematical notation, using parentheses and spaces as you wish for clarity. Use / for division and ^ for exponentiation. You may use * to indicate multiplication or simply put terms to be multiplied next to each other, like 2x. You can enter more than one function by separating functions with semicolons (;).
This tool can be used to investigate rational functions, like those in Whelk-Come to Mathematics, or exponential functions, as found in Shedding the Light or Trout Pond. It can also be used to investigate any other functions that can be explored with a graphing calculator or spreadsheet software.