The inequality 10x + 20y > 500 models all of the combinations of scores of 10 and 20 points that will give a total greater than 500 points in a game. What is not true about the values for x and y?

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The inequality 2003-09-04-00-00_files/i0280000.jpg models all of the combinations of scores of 20 and 30 points that will give a total greater than 400 points in a game. What is not true about the values for x and y?
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