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227: Munching Bugs
Sam the Chameleon really loves math. He uses math to help him find the bugs he likes to eat. When looking for a bug at a particular point, Sam moves along the xaxis to reach the point's x coordinate and then sticks out his long tongue (up or down) to reach the point's y coordinate.
Use this applet and click on any point to see Sam in action:
http://www.mste.uiuc.edu/pavel/java/chameleon/basic/index.htm
One day Sam decides he will use a math rule to help him choose which bugs to eat: he will always stick his tongue out 1 more unit than twice the distance that he walked to find the bug. [Sam always starts at (0, 0)].
 Name 3 points Sam could reach by following his rule.
 Name 3 points Sam could not reach by following his rule.
 Explain Sam’s rule using one or more equations.
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