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Linear Inequality Game

Inspired by Dan Meyer's post: In this game you're trying to guess a linear inequality by guessing points. When you find a true point, you can guess the inequality. The applet always picks a line through two visible points with integer coordinates. So it is very helpful to be able to find an equation of a line through two points. Most of my guesses look like y <= (slope)(x- xcoordinate) + ycoordinate. Very interested in feedback, so please comment, email or tweet me!