A simple way to print different plots might be useful.
The expression entry is not flexible. For example, 2x+3y produces an error, since “*” is required for multiplication. Also, e^x produces an error. With the help link broken, students will become frustrated when they are given an error message with no reference materials to help them fix the error.
With the limitations of the changing of the bounds, students will have a difficult time when the proper viewing rectangle is too large or too small. When the range is large, such as -1000 to 1000, the app freezes, since it is making 1,000,000 computations, instead of rescaling more reasonably.