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7.RP.1.2  Recognize and represent proportional relationships between quantities.
7.RP.1.2a  Decide whether two quantities are in a proportional relationahip, e.g., by testing for equivalent ratios in a table or graphing on a coorddinate plane and observing whether the graph is a straight line through the orgin. 7.RP.1.2b  Identify the constant of proportionality (unit rate) in tables, graphs, equations, diagrams, and verbal descriptions. 7.RP.1.2d  Explain what a points (x, y) on a graph of a proportional relationship means in terms of the situation, when special attention to the points (0, 0) and (1, r) where r is the unit rate. 
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