Students understand two quantities are proportional when there exists a constant (number) They apply this when using variable choices other than x and y.
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From EngageNY.org of the New York State Education Department. Grade 7 Mathematics Module 1, Topic A, Lesson 2.
Available from engageny.org/resource/grade-7-mathematics-module-1-topic-lesson-2; accessed 2015-05-29.
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