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Common Core Mathematics 6-8 
 ClusterAnalyze proportional relationships and use them to solve real-world and mathematical problems.
TopicRatios and Proportional Relationships
   Grade 7
  7.RP.2.d.Explain what a point (x, y) on the graph of a proportional relationship means in terms of the situation, with special attention to the points (0, 0) and (1, r) where r is the unit rate.