Enter the numerator and denominator for your slope, and then the y-intercept. The y-intercept has to be within the range of 17 and -17, or else it won't graph (the line stops at the edge of the map, so if you enter 18 or -18, it's already on the edge). Click the "New Graph" button to create a new line. You can't do straight lines (i.e. y=3). Other than that, you should be able to graph any linear equation.
I put this together in 15 minutes so don't expect too much. I will work on it a little more in the future, maybe even make exponential or quadratic graphs. If you find any glitches, bugs, errors, anything like that, please comment it so I can fix that.
